diff --git a/src/plugins/help/localhelpmanager.h b/src/plugins/help/localhelpmanager.h
index 62c4efa9250..2f84c39c44c 100644
--- a/src/plugins/help/localhelpmanager.h
+++ b/src/plugins/help/localhelpmanager.h
@@ -33,6 +33,7 @@
 #include <QMutex>
 #include <QObject>
 #include <QUrl>
+#include <QMetaType>
 
 QT_FORWARD_DECLARE_CLASS(QHelpEngine)