diff --git a/src/plugins/platforms/wayland/global/qwaylandclientextension.h b/src/plugins/platforms/wayland/global/qwaylandclientextension.h
index 37345202cc8..abf753249da 100644
--- a/src/plugins/platforms/wayland/global/qwaylandclientextension.h
+++ b/src/plugins/platforms/wayland/global/qwaylandclientextension.h
@@ -40,6 +40,7 @@
 #include <QObject>
 #include <QtWaylandClient/qtwaylandclientglobal.h>
 
+struct wl_interface;
 struct wl_registry;
 
 QT_BEGIN_NAMESPACE