diff --git a/src/ui/sand_box.c b/src/ui/sand_box.c
index 6415dba..0dcda39 100644
--- a/src/ui/sand_box.c
+++ b/src/ui/sand_box.c
@@ -55,7 +55,7 @@ static void on_bind_list_item_cb (GtkListItemFactory* factory, GtkListItem* list
 
     // Determine if this item should have an expander (i.e., if it has children)
     GListModel* child_model = create_child_model (text);
-    if (child_model) gtk_expander_set_expanded (GTK_TREE_EXPANDER (expander), TRUE);
+    if (child_model) gtk_tree_expander_set_expanded (GTK_TREE_EXPANDER (expander), TRUE);
     g_object_unref (child_model); // Cleanup
 }