diff --git a/src/frontends/qt4/Menus.h b/src/frontends/qt4/Menus.h
index 6f67d1d5e1..77da32d57f 100644
--- a/src/frontends/qt4/Menus.h
+++ b/src/frontends/qt4/Menus.h
@@ -18,6 +18,9 @@
 #include <QObject>
 #include <QHash>
 
+class QMenu;
+
+
 namespace lyx {
 namespace frontend {