Index: post-template.php
===================================================================
--- post-template.php	(revision 11559)
+++ post-template.php	(working copy)
@@ -805,7 +805,7 @@
  * @param array|string $args
  */
 function wp_page_menu( $args = array() ) {
-	$defaults = array('sort_column' => 'post_title', 'menu_class' => 'menu', 'echo' => true, 'link_before' => '', 'link_after' => '');
+	$defaults = array('sort_column' => 'menu_order, post_title', 'menu_class' => 'menu', 'echo' => true, 'link_before' => '', 'link_after' => '');
 	$args = wp_parse_args( $args, $defaults );
 	$args = apply_filters( 'wp_page_menu_args', $args );