diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index ab129b73e70..b28dcfc6f22 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -1398,6 +1398,8 @@ void QWidgetPrivate::createTLSysExtra()
 #endif
         if (isTipLabel || isAlphaWidget || q->inherits("QRollEffect"))
             qt_window_private(extra->topextra->window)->setAutomaticPositionAndResizeEnabled(false);
+
+        updateIsTranslucent();
     }
 
 }