diff --git a/CMakeLists.txt b/CMakeLists.txt
index 34330147..d5245ef8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -647,7 +647,7 @@ if(QML_DEBUGGING)
 endif()
 
 
-if(NOT MSVC)
+if(NOT MSVC AND NOT HAIKU)
 	if("${CMAKE_BUILD_TYPE}" STREQUAL "Debug" OR CI_BUILD)
 		target_compile_options(nheko PRIVATE "-Werror")
 	endif()
diff --git a/src/notifications/Manager.h b/src/notifications/Manager.h
index 4c9852cc..2b869efc 100644
--- a/src/notifications/Manager.h
+++ b/src/notifications/Manager.h
@@ -4,7 +4,7 @@
 #include <QObject>
 #include <QString>
 
-#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD)
+#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD) || defined(Q_OS_HAIKU)
 #include <QtDBus/QDBusArgument>
 #include <QtDBus/QDBusInterface>
 #endif
@@ -41,7 +41,7 @@ signals:
 public slots:
         void removeNotification(const QString &roomId, const QString &eventId);
 
-#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD)
+#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD) || defined(Q_OS_HAIKU)
 public:
         void closeNotifications(QString roomId);
 
@@ -61,7 +61,7 @@ private slots:
         void notificationReplied(uint id, QString reply);
 };
 
-#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD)
+#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD) || defined(Q_OS_HAIKU)
 QDBusArgument &
 operator<<(QDBusArgument &arg, const QImage &image);
 const QDBusArgument &