diff --git a/gtk/gtkapplicationwindow.c b/gtk/gtkapplicationwindow.c
index f1af0e2fa4..5ef96f6c84 100644
--- a/gtk/gtkapplicationwindow.c
+++ b/gtk/gtkapplicationwindow.c
@@ -258,7 +258,7 @@ gtk_application_window_update_menubar (GtkApplicationWindow *window)
 }
 
 static gchar *
-gtk_application_window_get_app_desktop_name ()
+gtk_application_window_get_app_desktop_name (void)
 {
   gchar *retval = NULL;