diff --git a/lcl/interfaces/qt/qtobjects.pas b/lcl/interfaces/qt/qtobjects.pas
index 5e06cf1bce..356905c2d2 100644
--- a/lcl/interfaces/qt/qtobjects.pas
+++ b/lcl/interfaces/qt/qtobjects.pas
@@ -615,7 +615,7 @@ begin
   begin
     AEvent := QLCLMessageEvent_create(LCLQt_Destroy);
     QLCLMessageEvent_setWParam(AEvent, PtrUInt(Self));
-    QCoreApplication_postEvent(QCoreApplication_instance(), AEvent, Ord(QtLowEventPriority));
+    QCoreApplication_postEvent(QCoreApplication_instance(), AEvent {$IFDEF QT_USE_4_3}, Ord(QtLowEventPriority) {$ENDIF});
     //WriteLn('Posted release event');
   end
   else