Index: wp-admin/admin-ajax.php
===================================================================
--- wp-admin/admin-ajax.php	(revision 7916)
+++ wp-admin/admin-ajax.php	(working copy)
@@ -588,6 +588,7 @@
 	$post_id = isset($_POST['post_id'])? intval($_POST['post_id']) : 0;
 	$title = isset($_POST['new_title'])? $_POST['new_title'] : '';
 	$slug = isset($_POST['new_slug'])? $_POST['new_slug'] : '';
+	$wpdb->update( $wpdb->posts, array( 'post_name' => $slug ), array( 'ID' => $post_id ) );
 	die(get_sample_permalink_html($post_id, $title, $slug));
 break;
 default :