diff --git a/include/ChatPage.h b/include/ChatPage.h
index 2107eccf..5ad22584 100644
--- a/include/ChatPage.h
+++ b/include/ChatPage.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef CHATPAGE_H
-#define CHATPAGE_H
+#pragma once
 
 #include <QPixmap>
 #include <QTimer>
@@ -86,5 +85,3 @@ private:
 	// Matrix Client API provider.
 	QSharedPointer<MatrixClient> client_;
 };
-
-#endif  // CHATPAGE_H
diff --git a/include/Deserializable.h b/include/Deserializable.h
index e4e07884..76290e1b 100644
--- a/include/Deserializable.h
+++ b/include/Deserializable.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef DESERIALIZABLE_H
-#define DESERIALIZABLE_H
+#pragma once
 
 #include <exception>
 
@@ -48,5 +47,3 @@ public:
 	{
 	}
 };
-
-#endif
diff --git a/include/EmojiCategory.h b/include/EmojiCategory.h
index a26711df..9cf0a177 100644
--- a/include/EmojiCategory.h
+++ b/include/EmojiCategory.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef EMOJI_CATEGORY_H
-#define EMOJI_CATEGORY_H
+#pragma once
 
 #include <QHBoxLayout>
 #include <QLabel>
@@ -58,5 +57,3 @@ inline void EmojiCategory::clickIndex(const QModelIndex &index)
 {
 	emit emojiSelected(index.data(Qt::UserRole).toString());
 }
-
-#endif  // EMOJI_CATEGORY_H
diff --git a/include/EmojiItemDelegate.h b/include/EmojiItemDelegate.h
index 5eeb4e24..d99fe2b6 100644
--- a/include/EmojiItemDelegate.h
+++ b/include/EmojiItemDelegate.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef EMOJI_ITEM_DELEGATE_H
-#define EMOJI_ITEM_DELEGATE_H
+#pragma once
 
 #include <QModelIndex>
 #include <QStandardItemModel>
@@ -37,5 +36,3 @@ public:
 private:
 	Emoji *data_;
 };
-
-#endif  // EMOJI_ITEM_DELEGATE_H
diff --git a/include/EmojiPanel.h b/include/EmojiPanel.h
index 99c8fa63..e87ab7a4 100644
--- a/include/EmojiPanel.h
+++ b/include/EmojiPanel.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef EMOJI_PANEL_H
-#define EMOJI_PANEL_H
+#pragma once
 
 #include <QFrame>
 #include <QGraphicsOpacityEffect>
@@ -66,5 +65,3 @@ private:
 
 	const int category_icon_size_ = 20;
 };
-
-#endif  // EMOJI_PANEL_H
diff --git a/include/EmojiPickButton.h b/include/EmojiPickButton.h
index 77bc5495..840aa5dd 100644
--- a/include/EmojiPickButton.h
+++ b/include/EmojiPickButton.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef EMOJI_PICK_BUTTON_H
-#define EMOJI_PICK_BUTTON_H
+#pragma once
 
 #include <QEvent>
 #include <QWidget>
@@ -46,5 +45,3 @@ private:
 
 	EmojiPanel *panel_;
 };
-
-#endif  // EMOJI_PICK_BUTTON_H
diff --git a/include/EmojiProvider.h b/include/EmojiProvider.h
index 630ea81a..40360c96 100644
--- a/include/EmojiProvider.h
+++ b/include/EmojiProvider.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef EMOJI_PROVIDER_H
-#define EMOJI_PROVIDER_H
+#pragma once
 
 #include <QFile>
 #include <QList>
@@ -41,5 +40,3 @@ public:
 	static const QList<Emoji> symbols;
 	static const QList<Emoji> flags;
 };
-
-#endif  // EMOJI_PROVIDER_H
diff --git a/include/ImageItem.h b/include/ImageItem.h
index 5d065b25..5953c6e5 100644
--- a/include/ImageItem.h
+++ b/include/ImageItem.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef TIMELINE_IMAGE_ITEM_H
-#define TIMELINE_IMAGE_ITEM_H
+#pragma once
 
 #include <QEvent>
 #include <QMouseEvent>
@@ -71,5 +70,3 @@ private:
 
 	QSharedPointer<MatrixClient> client_;
 };
-
-#endif  // TIMELINE_IMAGE_ITEM_H
diff --git a/include/ImageOverlayDialog.h b/include/ImageOverlayDialog.h
index 5ef4fb65..6763b9d1 100644
--- a/include/ImageOverlayDialog.h
+++ b/include/ImageOverlayDialog.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef IMAGE_OVERLAY_DIALOG_H
-#define IMAGE_OVERLAY_DIALOG_H
+#pragma once
 
 #include <QDialog>
 #include <QMouseEvent>
@@ -49,5 +48,3 @@ private:
 	QRect content_;
 	QRect close_button_;
 };
-
-#endif  // IMAGE_OVERLAY_DIALOG_H
diff --git a/include/InputValidator.h b/include/InputValidator.h
index 347ded9b..0d3e52ab 100644
--- a/include/InputValidator.h
+++ b/include/InputValidator.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MATRIX_INPUT_VALIDATOR_H
-#define MATRIX_INPUT_VALIDATOR_H
+#pragma once
 
 #include <QRegExp>
 #include <QRegExpValidator>
@@ -30,5 +29,3 @@ public:
 	static QRegExpValidator Password;
 	static QRegExpValidator Domain;
 };
-
-#endif  // MATRIX_INPUT_VALIDATOR_H
diff --git a/include/Login.h b/include/Login.h
index 98752083..c00eb6d2 100644
--- a/include/Login.h
+++ b/include/Login.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LOGIN_H
-#define LOGIN_H
+#pragma once
 
 #include <QJsonDocument>
 
@@ -77,5 +76,3 @@ inline QString LoginResponse::getUserId()
 {
 	return user_id_;
 }
-
-#endif  // LOGIN_H
diff --git a/include/LoginPage.h b/include/LoginPage.h
index ccd40072..774dd8e9 100644
--- a/include/LoginPage.h
+++ b/include/LoginPage.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LOGINPAGE_H
-#define LOGINPAGE_H
+#pragma once
 
 #include <QHBoxLayout>
 #include <QLabel>
@@ -86,5 +85,3 @@ private:
 	// Matrix client API provider.
 	QSharedPointer<MatrixClient> client_;
 };
-
-#endif  // LOGINPAGE_H
diff --git a/include/LoginSettings.h b/include/LoginSettings.h
index 3fc00488..62e9b2f5 100644
--- a/include/LoginSettings.h
+++ b/include/LoginSettings.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LOGIN_SETTINGS_H
-#define LOGIN_SETTINGS_H
+#pragma once
 
 #include <QFrame>
 
@@ -36,5 +35,3 @@ private:
 	TextField *input_;
 	FlatButton *submit_button_;
 };
-
-#endif  // LOGIN_SETTINGS_H
diff --git a/include/MainWindow.h b/include/MainWindow.h
index 182b959a..ae8d1648 100644
--- a/include/MainWindow.h
+++ b/include/MainWindow.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MAINWINDOW_H
-#define MAINWINDOW_H
+#pragma once
 
 #include <QMainWindow>
 #include <QSharedPointer>
@@ -76,5 +75,3 @@ private:
 	// Matrix Client API provider.
 	QSharedPointer<MatrixClient> client_;
 };
-
-#endif  // MAINWINDOW_H
diff --git a/include/MatrixClient.h b/include/MatrixClient.h
index 79813c95..2fdb57f0 100644
--- a/include/MatrixClient.h
+++ b/include/MatrixClient.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MATRIXCLIENT_H
-#define MATRIXCLIENT_H
+#pragma once
 
 #include <QtNetwork/QNetworkAccessManager>
 
@@ -160,5 +159,3 @@ inline void MatrixClient::incrementTransactionId()
 {
 	txn_id_ += 1;
 }
-
-#endif  // MATRIXCLIENT_H
diff --git a/include/Profile.h b/include/Profile.h
index 6dffa007..54016509 100644
--- a/include/Profile.h
+++ b/include/Profile.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef PROFILE_H
-#define PROFILE_H
+#pragma once
 
 #include <QJsonDocument>
 #include <QUrl>
@@ -45,5 +44,3 @@ inline QString ProfileResponse::getDisplayName()
 {
 	return display_name_;
 }
-
-#endif  // PROFILE_H
diff --git a/include/Register.h b/include/Register.h
index fb9438cb..71b3a15a 100644
--- a/include/Register.h
+++ b/include/Register.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef REGISTER_H
-#define REGISTER_H
+#pragma once
 
 #include <QJsonDocument>
 
@@ -77,5 +76,3 @@ inline QString RegisterResponse::getUserId()
 {
 	return user_id_;
 }
-
-#endif  // REGISTER_H
diff --git a/include/RegisterPage.h b/include/RegisterPage.h
index 9ac550bf..417aa6de 100644
--- a/include/RegisterPage.h
+++ b/include/RegisterPage.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef REGISTERPAGE_H
-#define REGISTERPAGE_H
+#pragma once
 
 #include <QHBoxLayout>
 #include <QLabel>
@@ -73,5 +72,3 @@ private:
 	// Matrix client API provider.
 	QSharedPointer<MatrixClient> client_;
 };
-
-#endif  // REGISTERPAGE_H
diff --git a/include/RoomInfoListItem.h b/include/RoomInfoListItem.h
index f45c9324..df7f11e8 100644
--- a/include/RoomInfoListItem.h
+++ b/include/RoomInfoListItem.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ROOMINFOLISTITEM_H
-#define ROOMINFOLISTITEM_H
+#pragma once
 
 #include <QtWidgets/QHBoxLayout>
 #include <QtWidgets/QLabel>
@@ -104,5 +103,3 @@ inline void RoomInfoListItem::setAvatar(const QImage &avatar_image)
 {
 	roomAvatar_->setImage(avatar_image);
 }
-
-#endif  // ROOMINFOLISTITEM_H
diff --git a/include/RoomList.h b/include/RoomList.h
index 348b1e28..34067430 100644
--- a/include/RoomList.h
+++ b/include/RoomList.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ROOMLIST_H
-#define ROOMLIST_H
+#pragma once
 
 #include <QImage>
 #include <QSharedPointer>
@@ -64,5 +63,3 @@ private:
 
 	QSharedPointer<MatrixClient> client_;
 };
-
-#endif  // ROOMLIST_H
diff --git a/include/RoomMessages.h b/include/RoomMessages.h
index 695580b3..0353af9a 100644
--- a/include/RoomMessages.h
+++ b/include/RoomMessages.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ROOM_MESSAGES_H
-#define ROOM_MESSAGES_H
+#pragma once
 
 #include <QJsonArray>
 #include <QJsonDocument>
@@ -52,5 +51,3 @@ inline QJsonArray RoomMessages::chunk() const
 {
 	return chunk_;
 }
-
-#endif  // ROOM_MESSAGES_H
diff --git a/include/RoomState.h b/include/RoomState.h
index a6cce540..788940e2 100644
--- a/include/RoomState.h
+++ b/include/RoomState.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ROOM_STATE_H
-#define ROOM_STATE_H
+#pragma once
 
 #include <QPixmap>
 
@@ -59,5 +58,3 @@ inline QString RoomState::resolveTopic() const
 {
 	return topic.content().topic().simplified();
 }
-
-#endif  // ROOM_STATE_H
diff --git a/include/SlidingStackWidget.h b/include/SlidingStackWidget.h
index d6733538..1cb01cea 100644
--- a/include/SlidingStackWidget.h
+++ b/include/SlidingStackWidget.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef SLIDINGSTACKWIDGET_H
-#define SLIDINGSTACKWIDGET_H
+#pragma once
 
 #include <QDebug>
 #include <QEasingCurve>
@@ -90,5 +89,3 @@ protected:
 	// Next widget's to show index.
 	int next_;
 };
-
-#endif  // SLIDINGSTACKWIDGET_H
diff --git a/include/Sync.h b/include/Sync.h
index bfa03c1b..26cfdb48 100644
--- a/include/Sync.h
+++ b/include/Sync.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef SYNC_H
-#define SYNC_H
+#pragma once
 
 #include <QJsonArray>
 #include <QJsonDocument>
@@ -196,5 +195,3 @@ inline QString SyncResponse::nextBatch() const
 {
 	return next_batch_;
 }
-
-#endif  // SYNC_H
diff --git a/include/TextInputWidget.h b/include/TextInputWidget.h
index c61298bf..225750f2 100644
--- a/include/TextInputWidget.h
+++ b/include/TextInputWidget.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef TEXT_INPUT_WIDGET_H
-#define TEXT_INPUT_WIDGET_H
+#pragma once
 
 #include <QHBoxLayout>
 #include <QPaintEvent>
@@ -65,5 +64,3 @@ private:
 	FlatButton *send_message_button_;
 	EmojiPickButton *emoji_button_;
 };
-
-#endif  // TEXT_INPUT_WIDGET_H
diff --git a/include/TimelineItem.h b/include/TimelineItem.h
index 5c4ce792..5db823b0 100644
--- a/include/TimelineItem.h
+++ b/include/TimelineItem.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef HISTORY_VIEW_ITEM_H
-#define HISTORY_VIEW_ITEM_H
+#pragma once
 
 #include <QHBoxLayout>
 #include <QLabel>
@@ -63,5 +62,3 @@ private:
 	QLabel *time_label_;
 	QLabel *content_label_;
 };
-
-#endif  // HISTORY_VIEW_ITEM_H
diff --git a/include/TimelineView.h b/include/TimelineView.h
index ba5642c3..7aeb4d47 100644
--- a/include/TimelineView.h
+++ b/include/TimelineView.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef HISTORY_VIEW_H
-#define HISTORY_VIEW_H
+#pragma once
 
 #include <QHBoxLayout>
 #include <QList>
@@ -119,5 +118,3 @@ private:
 	QList<PendingMessage> pending_msgs_;
 	QSharedPointer<MatrixClient> client_;
 };
-
-#endif  // HISTORY_VIEW_H
diff --git a/include/TimelineViewManager.h b/include/TimelineViewManager.h
index d18e7320..dc2445e2 100644
--- a/include/TimelineViewManager.h
+++ b/include/TimelineViewManager.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef HISTORY_VIEW_MANAGER_H
-#define HISTORY_VIEW_MANAGER_H
+#pragma once
 
 #include <QDebug>
 #include <QSharedPointer>
@@ -61,5 +60,3 @@ private:
 	QMap<QString, QSharedPointer<TimelineView>> views_;
 	QSharedPointer<MatrixClient> client_;
 };
-
-#endif
diff --git a/include/TopRoomBar.h b/include/TopRoomBar.h
index 1544ad46..304ec320 100644
--- a/include/TopRoomBar.h
+++ b/include/TopRoomBar.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef TOP_ROOM_BAR_H
-#define TOP_ROOM_BAR_H
+#pragma once
 
 #include <QIcon>
 #include <QImage>
@@ -78,5 +77,3 @@ inline void TopRoomBar::updateRoomTopic(const QString &topic)
 {
 	topic_label_->setText(topic);
 }
-
-#endif  // TOP_ROOM_BAR_H
diff --git a/include/UserInfoWidget.h b/include/UserInfoWidget.h
index e58cab60..e7dfbe25 100644
--- a/include/UserInfoWidget.h
+++ b/include/UserInfoWidget.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef USER_INFO_WIDGET_H
-#define USER_INFO_WIDGET_H
+#pragma once
 
 #include <QtWidgets/QHBoxLayout>
 #include <QtWidgets/QLabel>
@@ -61,5 +60,3 @@ private:
 
 	QImage avatar_image_;
 };
-
-#endif
diff --git a/include/WelcomePage.h b/include/WelcomePage.h
index 3cd6e664..13d9d141 100644
--- a/include/WelcomePage.h
+++ b/include/WelcomePage.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef WELCOMEPAGE_H
-#define WELCOMEPAGE_H
+#pragma once
 
 #include <QHBoxLayout>
 #include <QLabel>
@@ -57,5 +56,3 @@ private:
 	RaisedButton *register_button_;
 	RaisedButton *login_button_;
 };
-
-#endif  // WELCOMEPAGE_H
diff --git a/include/events/AliasesEventContent.h b/include/events/AliasesEventContent.h
index 44224fd9..a21aefd4 100644
--- a/include/events/AliasesEventContent.h
+++ b/include/events/AliasesEventContent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ALIASES_EVENT_CONTENT_H
-#define ALIASES_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 #include <QList>
@@ -44,5 +43,3 @@ inline QList<QString> AliasesEventContent::aliases() const
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // ALIASES_EVENT_CONTENT_H
diff --git a/include/events/AvatarEventContent.h b/include/events/AvatarEventContent.h
index adf85b1f..fa6997e0 100644
--- a/include/events/AvatarEventContent.h
+++ b/include/events/AvatarEventContent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef AVATAR_EVENT_CONTENT_H
-#define AVATAR_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 #include <QUrl>
@@ -48,5 +47,3 @@ inline QUrl AvatarEventContent::url() const
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // AVATAR_EVENT_CONTENT_H
diff --git a/include/events/CanonicalAliasEventContent.h b/include/events/CanonicalAliasEventContent.h
index bcaf514b..00df6207 100644
--- a/include/events/CanonicalAliasEventContent.h
+++ b/include/events/CanonicalAliasEventContent.h
@@ -1,4 +1,3 @@
-
 /*
  * nheko Copyright (C) 2017  Konstantinos Sideris <siderisk@auth.gr>
  *
@@ -16,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef CANONICAL_ALIAS_EVENT_CONTENT_H
-#define CANONICAL_ALIAS_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 
@@ -51,5 +49,3 @@ inline QString CanonicalAliasEventContent::alias() const
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // CANONICAL_ALIAS_EVENT_CONTENT_H
diff --git a/include/events/CreateEventContent.h b/include/events/CreateEventContent.h
index d48b8769..a0e40fb8 100644
--- a/include/events/CreateEventContent.h
+++ b/include/events/CreateEventContent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef CREATE_EVENT_CONTENT_H
-#define CREATE_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 
@@ -48,5 +47,3 @@ inline QString CreateEventContent::creator() const
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // CREATE_EVENT_CONTENT_H
diff --git a/include/events/Event.h b/include/events/Event.h
index e5a71c39..ea3eecea 100644
--- a/include/events/Event.h
+++ b/include/events/Event.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MATRIX_EVENT_H
-#define MATRIX_EVENT_H
+#pragma once
 
 #include <QJsonValue>
 
@@ -96,5 +95,3 @@ void Event<Content>::deserialize(const QJsonValue &data)
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MATRIX_EVENT_H
diff --git a/include/events/HistoryVisibilityEventContent.h b/include/events/HistoryVisibilityEventContent.h
index 7b00d85e..1df83d09 100644
--- a/include/events/HistoryVisibilityEventContent.h
+++ b/include/events/HistoryVisibilityEventContent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef HISTORY_VISIBILITY_EVENT_CONTENT_H
-#define HISTORY_VISIBILITY_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 
@@ -50,5 +49,3 @@ inline HistoryVisibility HistoryVisibilityEventContent::historyVisibility() cons
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // HISTORY_VISIBILITY_EVENT_CONTENT_H
diff --git a/include/events/JoinRulesEventContent.h b/include/events/JoinRulesEventContent.h
index 9b3d27c3..746188e4 100644
--- a/include/events/JoinRulesEventContent.h
+++ b/include/events/JoinRulesEventContent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef JOIN_RULES_EVENT_CONTENT_H
-#define JOIN_RULES_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 
@@ -62,5 +61,3 @@ inline JoinRule JoinRulesEventContent::joinRule() const
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // JOIN_RULES_EVENT_CONTENT_H
diff --git a/include/events/MemberEventContent.h b/include/events/MemberEventContent.h
index 9fd1d7d9..f3714462 100644
--- a/include/events/MemberEventContent.h
+++ b/include/events/MemberEventContent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MEMBER_EVENT_CONTENT_H
-#define MEMBER_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 #include <QUrl>
@@ -79,5 +78,3 @@ inline Membership MemberEventContent::membershipState() const
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MEMBER_EVENT_CONTENT_H
diff --git a/include/events/MessageEvent.h b/include/events/MessageEvent.h
index 617514b0..d1fb1b4a 100644
--- a/include/events/MessageEvent.h
+++ b/include/events/MessageEvent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MATRIX_MESSAGE_EVENT_H
-#define MATRIX_MESSAGE_EVENT_H
+#pragma once
 
 #include "MessageEventContent.h"
 #include "RoomEvent.h"
@@ -63,5 +62,3 @@ struct ThumbnailInfo {
 }  // namespace messages
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MATRIX_MESSAGE_EVENT_H
diff --git a/include/events/MessageEventContent.h b/include/events/MessageEventContent.h
index 1ef730ed..a9d7e470 100644
--- a/include/events/MessageEventContent.h
+++ b/include/events/MessageEventContent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MESSAGE_EVENT_CONTENT_H
-#define MESSAGE_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 
@@ -74,5 +73,3 @@ inline QString MessageEventContent::body() const
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MESSAGE_EVENT_CONTENT_H
diff --git a/include/events/NameEventContent.h b/include/events/NameEventContent.h
index 970edab8..bf5a9209 100644
--- a/include/events/NameEventContent.h
+++ b/include/events/NameEventContent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef NAME_EVENT_CONTENT_H
-#define NAME_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 
@@ -47,5 +46,3 @@ inline QString NameEventContent::name() const
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // NAME_EVENT_CONTENT_H
diff --git a/include/events/PowerLevelsEventContent.h b/include/events/PowerLevelsEventContent.h
index bac4a42b..e5762812 100644
--- a/include/events/PowerLevelsEventContent.h
+++ b/include/events/PowerLevelsEventContent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef POWER_LEVELS_EVENT_CONTENT_H
-#define POWER_LEVELS_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 #include <QMap>
@@ -104,5 +103,3 @@ inline int PowerLevelsEventContent::usersDefaultLevel() const
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // POWER_LEVELS_EVENT_CONTENT_H
diff --git a/include/events/RoomEvent.h b/include/events/RoomEvent.h
index 9c2e9945..b73d5ce9 100644
--- a/include/events/RoomEvent.h
+++ b/include/events/RoomEvent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MATRIX_ROOM_EVENT_H
-#define MATRIX_ROOM_EVENT_H
+#pragma once
 
 #include <QJsonValue>
 #include <QString>
@@ -97,5 +96,3 @@ void RoomEvent<Content>::deserialize(const QJsonValue &data)
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MATRIX_ROOM_EVENT_H
diff --git a/include/events/StateEvent.h b/include/events/StateEvent.h
index 35d5fa31..2075a996 100644
--- a/include/events/StateEvent.h
+++ b/include/events/StateEvent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MATRIX_STATE_EVENT_H
-#define MATRIX_STATE_EVENT_H
+#pragma once
 
 #include <QJsonValue>
 
@@ -69,5 +68,3 @@ void StateEvent<Content>::deserialize(const QJsonValue &data)
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MATRIX_STATE_EVENT_H
diff --git a/include/events/TopicEventContent.h b/include/events/TopicEventContent.h
index e3062d0c..460d019e 100644
--- a/include/events/TopicEventContent.h
+++ b/include/events/TopicEventContent.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef TOPIC_EVENT_CONTENT_H
-#define TOPIC_EVENT_CONTENT_H
+#pragma once
 
 #include <QJsonValue>
 
@@ -47,5 +46,3 @@ inline QString TopicEventContent::topic() const
 }
 }  // namespace events
 }  // namespace matrix
-
-#endif  // TOPIC_EVENT_CONTENT_H
diff --git a/include/events/messages/Audio.h b/include/events/messages/Audio.h
index c3b5a4ef..3eeb5fc4 100644
--- a/include/events/messages/Audio.h
+++ b/include/events/messages/Audio.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MESSAGE_EVENT_AUDIO_H
-#define MESSAGE_EVENT_AUDIO_H
+#pragma once
 
 #include <QJsonObject>
 
@@ -61,5 +60,3 @@ inline AudioInfo Audio::info() const
 }  // namespace messages
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MESSAGE_EVENT_AUDIO_H
diff --git a/include/events/messages/Emote.h b/include/events/messages/Emote.h
index 63b2b96b..28118b1a 100644
--- a/include/events/messages/Emote.h
+++ b/include/events/messages/Emote.h
@@ -1,4 +1,3 @@
-
 /*
  * nheko Copyright (C) 2017  Konstantinos Sideris <siderisk@auth.gr>
  *
@@ -16,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MESSAGE_EVENT_EMOTE_H
-#define MESSAGE_EVENT_EMOTE_H
+#pragma once
 
 #include <QJsonObject>
 
@@ -37,5 +35,3 @@ public:
 }  // namespace messages
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MESSAGE_EVENT_EMOTE_H
diff --git a/include/events/messages/File.h b/include/events/messages/File.h
index 8fe61615..59e0ec15 100644
--- a/include/events/messages/File.h
+++ b/include/events/messages/File.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MESSAGE_EVENT_FILE_H
-#define MESSAGE_EVENT_FILE_H
+#pragma once
 
 #include <QJsonObject>
 
@@ -72,5 +71,3 @@ inline FileInfo File::info() const
 }  // namespace messages
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MESSAGE_EVENT_FILE_H
diff --git a/include/events/messages/Image.h b/include/events/messages/Image.h
index 5a329e4d..d73aa5c8 100644
--- a/include/events/messages/Image.h
+++ b/include/events/messages/Image.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MESSAGE_EVENT_IMAGE_H
-#define MESSAGE_EVENT_IMAGE_H
+#pragma once
 
 #include <QJsonObject>
 
@@ -65,5 +64,3 @@ inline ImageInfo Image::info() const
 }  // namespace messages
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MESSAGE_EVENT_IMAGE_H
diff --git a/include/events/messages/Location.h b/include/events/messages/Location.h
index 7c64cede..c245112b 100644
--- a/include/events/messages/Location.h
+++ b/include/events/messages/Location.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MESSAGE_EVENT_LOCATION_H
-#define MESSAGE_EVENT_LOCATION_H
+#pragma once
 
 #include <QJsonObject>
 
@@ -61,5 +60,3 @@ inline LocationInfo Location::info() const
 }  // namespace messages
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MESSAGE_EVENT_LOCATION_H
diff --git a/include/events/messages/Notice.h b/include/events/messages/Notice.h
index db94b273..4ea9b11f 100644
--- a/include/events/messages/Notice.h
+++ b/include/events/messages/Notice.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MESSAGE_EVENT_NOTICE_H
-#define MESSAGE_EVENT_NOTICE_H
+#pragma once
 
 #include <QJsonObject>
 
@@ -36,5 +35,3 @@ public:
 }  // namespace messages
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MESSAGE_EVENT_NOTICE_H
diff --git a/include/events/messages/Text.h b/include/events/messages/Text.h
index f116e78d..e98a4c1b 100644
--- a/include/events/messages/Text.h
+++ b/include/events/messages/Text.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MESSAGE_EVENT_TEXT_H
-#define MESSAGE_EVENT_TEXT_H
+#pragma once
 
 #include <QJsonObject>
 
@@ -36,5 +35,3 @@ public:
 }  // namespace messages
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MESSAGE_EVENT_TEXT_H
diff --git a/include/events/messages/Video.h b/include/events/messages/Video.h
index bd307cf7..3a373928 100644
--- a/include/events/messages/Video.h
+++ b/include/events/messages/Video.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef MESSAGE_EVENT_VIDEO_H
-#define MESSAGE_EVENT_VIDEO_H
+#pragma once
 
 #include <QJsonObject>
 
@@ -66,5 +65,3 @@ inline VideoInfo Video::info() const
 }  // namespace messages
 }  // namespace events
 }  // namespace matrix
-
-#endif  // MESSAGE_EVENT_VIDEO_H
diff --git a/include/ui/Avatar.h b/include/ui/Avatar.h
index afbf6aad..b99ee683 100644
--- a/include/ui/Avatar.h
+++ b/include/ui/Avatar.h
@@ -1,5 +1,4 @@
-#ifndef UI_AVATAR_H
-#define UI_AVATAR_H
+#pragma once
 
 #include <QIcon>
 #include <QImage>
@@ -47,5 +46,3 @@ private:
 	QPixmap pixmap_;
 	int size_;
 };
-
-#endif  // UI_AVATAR_H
diff --git a/include/ui/Badge.h b/include/ui/Badge.h
index d84dd7ef..b994cfdf 100644
--- a/include/ui/Badge.h
+++ b/include/ui/Badge.h
@@ -1,5 +1,4 @@
-#ifndef UI_BADGE_H
-#define UI_BADGE_H
+#pragma once
 
 #include <QColor>
 #include <QIcon>
@@ -62,5 +61,3 @@ private:
 	qreal x_;
 	qreal y_;
 };
-
-#endif  // UI_BADGE_H
diff --git a/include/ui/CircularProgress.h b/include/ui/CircularProgress.h
index bb8156ae..78a32dd8 100644
--- a/include/ui/CircularProgress.h
+++ b/include/ui/CircularProgress.h
@@ -1,5 +1,4 @@
-#ifndef UI_CIRCULAR_PROGRESS_H
-#define UI_CIRCULAR_PROGRESS_H
+#pragma once
 
 #include <QObject>
 #include <QProgressBar>
@@ -110,5 +109,3 @@ inline int CircularProgressDelegate::angle() const
 {
 	return angle_;
 }
-
-#endif  // UI_CIRCULAR_PROGRESS_H
diff --git a/include/ui/FlatButton.h b/include/ui/FlatButton.h
index 6e2eb149..5efdb838 100644
--- a/include/ui/FlatButton.h
+++ b/include/ui/FlatButton.h
@@ -1,5 +1,4 @@
-#ifndef UI_FLAT_BUTTON_H
-#define UI_FLAT_BUTTON_H
+#pragma once
 
 #include <QPaintEvent>
 #include <QPainter>
@@ -170,5 +169,3 @@ private:
 
 	bool use_fixed_ripple_radius_;
 };
-
-#endif  // UI_FLAT_BUTTON_H
diff --git a/include/ui/OverlayModal.h b/include/ui/OverlayModal.h
index d90eccea..d6efd29e 100644
--- a/include/ui/OverlayModal.h
+++ b/include/ui/OverlayModal.h
@@ -15,8 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef UI_OVERLAY_MODAL_H
-#define UI_OVERLAY_MODAL_H
+#pragma once
 
 #include <QGraphicsOpacityEffect>
 #include <QPaintEvent>
@@ -57,5 +56,3 @@ inline void OverlayModal::setColor(QColor color)
 {
 	color_ = color;
 }
-
-#endif  // UI_OVERLAY_MODAL_H
diff --git a/include/ui/OverlayWidget.h b/include/ui/OverlayWidget.h
index 36b42dc9..b9655cf6 100644
--- a/include/ui/OverlayWidget.h
+++ b/include/ui/OverlayWidget.h
@@ -1,5 +1,4 @@
-#ifndef UI_OVERLAY_WIDGET_H
-#define UI_OVERLAY_WIDGET_H
+#pragma once
 
 #include <QEvent>
 #include <QWidget>
@@ -17,5 +16,3 @@ protected:
 
 	QRect overlayGeometry() const;
 };
-
-#endif  // UI_OVERLAY_WIDGET_H
diff --git a/include/ui/RaisedButton.h b/include/ui/RaisedButton.h
index 7a46173f..558d15eb 100644
--- a/include/ui/RaisedButton.h
+++ b/include/ui/RaisedButton.h
@@ -1,5 +1,4 @@
-#ifndef UI_RAISED_BUTTON_H
-#define UI_RAISED_BUTTON_H
+#pragma once
 
 #include <QGraphicsDropShadowEffect>
 #include <QState>
@@ -27,5 +26,3 @@ private:
 	QState *pressed_state_;
 	QGraphicsDropShadowEffect *effect_;
 };
-
-#endif  // UI_RAISED_BUTTON_H
diff --git a/include/ui/Ripple.h b/include/ui/Ripple.h
index a66a583e..e04e7173 100644
--- a/include/ui/Ripple.h
+++ b/include/ui/Ripple.h
@@ -1,5 +1,4 @@
-#ifndef UI_RIPPLE_H
-#define UI_RIPPLE_H
+#pragma once
 
 #include <QBrush>
 #include <QEasingCurve>
@@ -132,5 +131,3 @@ inline void Ripple::setDuration(int msecs)
 	radius_anim_->setDuration(msecs);
 	opacity_anim_->setDuration(msecs);
 }
-
-#endif  // UI_RIPPLE_H
diff --git a/include/ui/RippleOverlay.h b/include/ui/RippleOverlay.h
index 54398efa..b3fb9a4c 100644
--- a/include/ui/RippleOverlay.h
+++ b/include/ui/RippleOverlay.h
@@ -1,5 +1,4 @@
-#ifndef UI_RIPPLE_OVERLAY_H
-#define UI_RIPPLE_OVERLAY_H
+#pragma once
 
 #include <QPainterPath>
 
@@ -54,5 +53,3 @@ inline void RippleOverlay::setClipPath(const QPainterPath &path)
 	clip_path_ = path;
 	update();
 }
-
-#endif  // UI_RIPPLE_OVERLAY_H
diff --git a/include/ui/TextField.h b/include/ui/TextField.h
index 953c8f29..11319f24 100644
--- a/include/ui/TextField.h
+++ b/include/ui/TextField.h
@@ -1,5 +1,4 @@
-#ifndef UI_TEXT_FIELD_H
-#define UI_TEXT_FIELD_H
+#pragma once
 
 #include <QColor>
 #include <QLineEdit>
@@ -166,5 +165,3 @@ inline qreal TextFieldStateMachine::progress() const
 {
 	return progress_;
 }
-
-#endif  // UI_TEXT_FIELD_H
diff --git a/include/ui/Theme.h b/include/ui/Theme.h
index 795425e4..95eb5277 100644
--- a/include/ui/Theme.h
+++ b/include/ui/Theme.h
@@ -1,5 +1,4 @@
-#ifndef UI_THEME_H
-#define UI_THEME_H
+#pragma once
 
 #include <QColor>
 #include <QHash>
@@ -85,5 +84,3 @@ private:
 
 	QHash<QString, QColor> colors_;
 };
-
-#endif  // UI_THEME_H
diff --git a/include/ui/ThemeManager.h b/include/ui/ThemeManager.h
index 426d71ec..98ed8193 100644
--- a/include/ui/ThemeManager.h
+++ b/include/ui/ThemeManager.h
@@ -1,5 +1,4 @@
-#ifndef UI_THEME_MANAGER_H
-#define UI_THEME_MANAGER_H
+#pragma once
 
 #include <QCommonStyle>
 
@@ -29,5 +28,3 @@ inline ThemeManager &ThemeManager::instance()
 	static ThemeManager instance;
 	return instance;
 }
-
-#endif  // UI_THEME_MANAGER_H