diff --git a/src/plugins/help/localhelpmanager.h b/src/plugins/help/localhelpmanager.h
index fdb0ab80d6b..6712ae5f98b 100644
--- a/src/plugins/help/localhelpmanager.h
+++ b/src/plugins/help/localhelpmanager.h
@@ -34,6 +34,7 @@
 #include <QObject>
 
 QT_FORWARD_DECLARE_CLASS(QHelpEngine)
+QT_FORWARD_DECLARE_CLASS(QUrl)
 
 class BookmarkManager;