Index: wp-includes/post-template.php
===================================================================
--- wp-includes/post-template.php	(revision 6381)
+++ wp-includes/post-template.php	(working copy)
@@ -318,6 +318,7 @@
 	$r['exclude'] = implode(',', apply_filters('wp_list_pages_excludes', explode(',', $r['exclude'])));
 
 	// Query pages.
+	$r['hierarchical'] = 0;
 	$pages = get_pages($r);
 
 	if ( !empty($pages) ) {