Index: wp-includes/widgets.php
===================================================================
--- wp-includes/widgets.php	(revision 10347)
+++ wp-includes/widgets.php	(working copy)
@@ -678,7 +678,10 @@
 		$sortby = 'menu_order, post_title';
 	}
 
-	$out = wp_list_pages( array('title_li' => '', 'echo' => 0, 'sort_column' => $sortby, 'exclude' => $exclude) );
+	$out = wp_list_pages( apply_filters('widget_pages_args', array(
+	    'title_li' => '', 'echo' => 0, 
+	    'sort_column' => $sortby, 'exclude' => $exclude
+	)));
 
 	if ( !empty( $out ) ) {
 ?>