diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index b2b5c539e5..5bff30524a 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -9146,6 +9146,9 @@ bool QWidget::event(QEvent *event)
             const QWindow *win = te->window;
             d->setWinId((win && win->handle()) ? win->handle()->winId() : 0);
         }
+#ifndef QT_NO_OPENGL
+        d->renderToTextureReallyDirty = 1;
+#endif
         break;
 #ifndef QT_NO_PROPERTIES
     case QEvent::DynamicPropertyChange: {