diff --git a/gb.qt5/src/x11/main.cpp b/gb.qt5/src/x11/main.cpp
index 8450134b0..c61e190c0 100644
--- a/gb.qt5/src/x11/main.cpp
+++ b/gb.qt5/src/x11/main.cpp
@@ -320,7 +320,8 @@ static void window_remap(QWidget *window)
 
 static void window_set_properties(QWidget *window, int which, QT_WINDOW_PROP *prop)
 {
-	X11_flush();
+	//X11_flush();
+	qApp->sync();
 
 	if (which & (PROP_STACKING | PROP_SKIP_TASKBAR))
 	{
@@ -344,7 +345,7 @@ static void window_set_properties(QWidget *window, int which, QT_WINDOW_PROP *pr
 	if (which & PROP_STICKY)
 		X11_window_set_desktop(window->effectiveWinId(), window->isVisible(), prop->sticky ? 0xFFFFFFFF : X11_get_current_desktop());
 
-	X11_flush();
+	qApp->sync();
 }
 
 static void window_set_user_time(QWidget *window, int timestamp)