diff --git a/tests/testgtk.c b/tests/testgtk.c
index 2e6304a9e4..343b4bc52b 100644
--- a/tests/testgtk.c
+++ b/tests/testgtk.c
@@ -6006,7 +6006,7 @@ create_settings (GtkWidget *widget)
 
   if (!window)
     {
-      window = create_prop_editor (G_OBJECT (gtk_settings_get_default ()), 0);
+      window = create_prop_editor (G_OBJECT (gtk_settings_get_default ()), GTK_TYPE_SETTINGS);
       gtk_window_set_screen (GTK_WINDOW (window),
                              gtk_widget_get_screen (widget));