--- ./xs/GtkTreeModel.xs.tv	2003-07-22 20:54:08.000000000 +0200
+++ ./xs/GtkTreeModel.xs	2003-07-22 21:01:52.000000000 +0200
@@ -374,7 +374,7 @@
 GtkTreeIter_copy *
 gtk_tree_model_iter_nth_child (tree_model, parent, n)
 	GtkTreeModel *tree_model
-	GtkTreeIter *parent
+	GtkTreeIter_ornull *parent
 	gint n
     PREINIT:
 	GtkTreeIter iter;