diff --git a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidgets.h b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidgets.h
index c5aa644a7bdfc81d8e664f6fd85aa0af27ba37a1..747fc49725e4f49282538543d98bc2c9400e91a5 100644
--- a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidgets.h
+++ b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidgets.h
@@ -38,9 +38,10 @@
 #include <QToolButton>
 #include <QStyledItemDelegate>
 
+QT_BEGIN_NAMESPACE
 class QDirModel;
-
-QT_FORWARD_DECLARE_CLASS(QLabel);
+class QLabel;
+QT_END_NAMESPACE
 
 namespace QmlDesigner {