diff --git a/src/plugins/qmljseditor/qmljsoutline.h b/src/plugins/qmljseditor/qmljsoutline.h
index 799aaf812ad..81c3f56b6af 100644
--- a/src/plugins/qmljseditor/qmljsoutline.h
+++ b/src/plugins/qmljseditor/qmljsoutline.h
@@ -31,6 +31,10 @@
 
 #include <QSortFilterProxyModel>
 
+QT_BEGIN_NAMESPACE
+class QAction;
+QT_END_NAMESPACE
+
 namespace Core { class IEditor; }
 
 namespace QmlJS { class Editor; }