diff --git a/src/gui/painting/qregion.h b/src/gui/painting/qregion.h
index 72710553ef..4f0a071da8 100644
--- a/src/gui/painting/qregion.h
+++ b/src/gui/painting/qregion.h
@@ -178,6 +178,7 @@ Q_GUI_EXPORT
     static const struct QRegionData shared_empty;
     static void cleanUp(QRegionData *x);
 };
+Q_DECLARE_SHARED_NOT_MOVABLE_UNTIL_QT6(QRegion)
 
 /*****************************************************************************
   QRegion stream functions