diff --git a/gtk/gtkapplication-wayland.c b/gtk/gtkapplication-wayland.c
index 48c5183788..f002c3fc66 100644
--- a/gtk/gtkapplication-wayland.c
+++ b/gtk/gtkapplication-wayland.c
@@ -146,7 +146,8 @@ gtk_application_impl_wayland_inhibit (GtkApplicationImpl         *impl,
         }
     }
 
-  inhibitor->dbus_cookie = ((GtkApplicationImplWaylandClass *) G_OBJECT_GET_CLASS (wayland))->dbus_inhibit (impl, window, flags, reason);
+  if (flags)
+    inhibitor->dbus_cookie = ((GtkApplicationImplWaylandClass *) G_OBJECT_GET_CLASS (wayland))->dbus_inhibit (impl, window, flags, reason);
 
   return inhibitor->cookie;
 }