diff --git a/demos/gtk-demo/main.c b/demos/gtk-demo/main.c
index 51846edaeb..7d5ac5477b 100644
--- a/demos/gtk-demo/main.c
+++ b/demos/gtk-demo/main.c
@@ -1040,7 +1040,7 @@ activate (GApplication *app)
   listmodel = create_demo_model ();
   treemodel = gtk_tree_list_model_new (FALSE,
                                        G_LIST_MODEL (listmodel),
-                                       FALSE,
+                                       TRUE,
                                        get_child_model,
                                        NULL,
                                        NULL);