diff --git a/modules/gui/qt/maininterface/compositor_dcomp_acrylicsurface.cpp b/modules/gui/qt/maininterface/compositor_dcomp_acrylicsurface.cpp
index bb8bea404d..e7a7162384 100644
--- a/modules/gui/qt/maininterface/compositor_dcomp_acrylicsurface.cpp
+++ b/modules/gui/qt/maininterface/compositor_dcomp_acrylicsurface.cpp
@@ -126,7 +126,11 @@ CompositorDCompositionAcrylicSurface::~CompositorDCompositionAcrylicSurface()
         DestroyWindow(m_dummyWindow);
 }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+bool CompositorDCompositionAcrylicSurface::nativeEventFilter(const QByteArray &, void *message, qintptr *)
+#else
 bool CompositorDCompositionAcrylicSurface::nativeEventFilter(const QByteArray &, void *message, long *)
+#endif
 {
     MSG* msg = static_cast<MSG*>( message );
 
diff --git a/modules/gui/qt/maininterface/compositor_dcomp_acrylicsurface.hpp b/modules/gui/qt/maininterface/compositor_dcomp_acrylicsurface.hpp
index 26b9927176..87288c71e6 100644
--- a/modules/gui/qt/maininterface/compositor_dcomp_acrylicsurface.hpp
+++ b/modules/gui/qt/maininterface/compositor_dcomp_acrylicsurface.hpp
@@ -175,7 +175,11 @@ public:
     ~CompositorDCompositionAcrylicSurface();
 
 protected:
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    bool nativeEventFilter(const QByteArray &eventType, void *message, qintptr *result) override;
+#else
     bool nativeEventFilter(const QByteArray &eventType, void *message, long *result) override;
+#endif
 
 private:
     bool init(ID3D11Device *device);
diff --git a/modules/gui/qt/maininterface/compositor_win7.cpp b/modules/gui/qt/maininterface/compositor_win7.cpp
index 4c7f472a5f..aa809f57ae 100644
--- a/modules/gui/qt/maininterface/compositor_win7.cpp
+++ b/modules/gui/qt/maininterface/compositor_win7.cpp
@@ -287,7 +287,11 @@ Win7NativeEventFilter::Win7NativeEventFilter(QObject* parent)
 }
 
 //parse native events that are not reported by Qt
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+bool Win7NativeEventFilter::nativeEventFilter(const QByteArray&, void* message, qintptr*)
+#else
 bool Win7NativeEventFilter::nativeEventFilter(const QByteArray&, void* message, long*)
+#endif
 {
     MSG * msg = static_cast<MSG*>( message );
 
diff --git a/modules/gui/qt/maininterface/compositor_win7.hpp b/modules/gui/qt/maininterface/compositor_win7.hpp
index 06ebed9ae5..094e35c75c 100644
--- a/modules/gui/qt/maininterface/compositor_win7.hpp
+++ b/modules/gui/qt/maininterface/compositor_win7.hpp
@@ -34,7 +34,11 @@ class Win7NativeEventFilter : public QObject, public QAbstractNativeEventFilter
 public:
     Win7NativeEventFilter( QObject* parent = nullptr );
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    bool nativeEventFilter(const QByteArray &, void *message, qintptr* /* result */);
+#else
     bool nativeEventFilter(const QByteArray &, void *message, long* /* result */);
+#endif
 signals:
     void windowStyleChanged();
 };
diff --git a/modules/gui/qt/maininterface/mainctx_win32.cpp b/modules/gui/qt/maininterface/mainctx_win32.cpp
index b435ad8afa..2579f79856 100644
--- a/modules/gui/qt/maininterface/mainctx_win32.cpp
+++ b/modules/gui/qt/maininterface/mainctx_win32.cpp
@@ -246,7 +246,11 @@ public:
             return qRound(static_cast<qreal>(8) * window->devicePixelRatio());
     }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    bool nativeEventFilter(const QByteArray &, void *message, qintptr *result) override
+#else
     bool nativeEventFilter(const QByteArray &, void *message, long *result) override
+#endif
     {
         MSG* msg = static_cast<MSG*>( message );
 
@@ -665,7 +669,11 @@ void WinTaskbarWidget::createTaskBarButtons()
         changeThumbbarButtons( THEMIM->getPlayingState() );
 }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+bool WinTaskbarWidget::nativeEventFilter(const QByteArray &, void *message, qintptr* /* result */)
+#else
 bool WinTaskbarWidget::nativeEventFilter(const QByteArray &, void *message, long* /* result */)
+#endif
 {
     MSG * msg = static_cast<MSG*>( message );
     if (msg->hwnd != WinId(m_window))
@@ -905,7 +913,11 @@ bool InterfaceWindowHandlerWin32::eventFilter(QObject* obj, QEvent* ev)
     return ret;
 }
 
-bool InterfaceWindowHandlerWin32::nativeEventFilter(const QByteArray &, void *message, long *result)
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    bool InterfaceWindowHandlerWin32::nativeEventFilter(const QByteArray &, void *message, qintptr *result)
+#else
+    bool InterfaceWindowHandlerWin32::nativeEventFilter(const QByteArray &, void *message, long *result)
+#endif
 {
     MSG* msg = static_cast<MSG*>( message );
 
diff --git a/modules/gui/qt/maininterface/mainctx_win32.hpp b/modules/gui/qt/maininterface/mainctx_win32.hpp
index 8a33a82b7d..256c7a93db 100644
--- a/modules/gui/qt/maininterface/mainctx_win32.hpp
+++ b/modules/gui/qt/maininterface/mainctx_win32.hpp
@@ -36,7 +36,11 @@ public:
     virtual ~WinTaskbarWidget();
 
 private:
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    bool nativeEventFilter(const QByteArray &eventType, void *message, qintptr *result) override;
+#else
     bool nativeEventFilter(const QByteArray &eventType, void *message, long *result) override;
+#endif
     void createTaskBarButtons();
 
 private slots:
@@ -77,7 +81,11 @@ public:
     bool eventFilter(QObject*, QEvent* event) override;
 
 protected:
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    bool nativeEventFilter(const QByteArray &eventType, void *message, qintptr *result) override;
+#else
     bool nativeEventFilter(const QByteArray &eventType, void *message, long *result) override;
+#endif
 
 private:
 #if QT_CLIENT_SIDE_DECORATION_AVAILABLE
diff --git a/modules/gui/qt/style/windowsthemeprovider.cpp b/modules/gui/qt/style/windowsthemeprovider.cpp
index 755623131e..edbc62eba7 100644
--- a/modules/gui/qt/style/windowsthemeprovider.cpp
+++ b/modules/gui/qt/style/windowsthemeprovider.cpp
@@ -50,7 +50,11 @@ public:
         return !m_settings.value(WIN_THEME_SETTING_LIGHT_THEME_KEY).toBool();
     }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    bool nativeEventFilter(const QByteArray &, void *message, qintptr *)
+#else
     bool nativeEventFilter(const QByteArray &, void *message, long *)
+#endif
     {
         MSG* msg = static_cast<MSG*>( message );
         if ( msg->message == WM_SETTINGCHANGE