diff --git a/src/plugins/qmldesigner/components/integration/stackedutilitypanelcontroller.h b/src/plugins/qmldesigner/components/integration/stackedutilitypanelcontroller.h
index 25a27f32222..09028695c3f 100644
--- a/src/plugins/qmldesigner/components/integration/stackedutilitypanelcontroller.h
+++ b/src/plugins/qmldesigner/components/integration/stackedutilitypanelcontroller.h
@@ -32,7 +32,9 @@
 
 #include "utilitypanelcontroller.h"
 
+QT_BEGIN_NAMESPACE
 class QStackedWidget;
+QT_END_NAMESPACE
 
 namespace QmlDesigner {