diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index f2da07192e..ce1cd52f65 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -397,7 +397,7 @@ function wp_default_scripts( &$scripts ) {
 		) );
 
 		// Custom Navigation
-		$scripts->add( 'nav-menu', "/wp-admin/js/nav-menu$suffix.js", false, '20100322' );
+		$scripts->add( 'nav-menu', "/wp-admin/js/nav-menu$suffix.js", false, '20100322b' );
 		$scripts->localize( 'nav-menu', 'navMenuL10n', array(
 			'custom' => _x('Custom', 'menu nav item type'),
 			'thickbox' => _x('Edit Menu Item', 'Thickbox Title'),
@@ -476,7 +476,7 @@ function wp_default_styles( &$styles ) {
 	$styles->add( 'farbtastic', '/wp-admin/css/farbtastic.css', array(), '1.2' );
 	$styles->add( 'jcrop', '/wp-includes/js/jcrop/jquery.Jcrop.css', array(), '0.9.8' );
 	$styles->add( 'imgareaselect', '/wp-includes/js/imgareaselect/imgareaselect.css', array(), '0.9.1' );
-	$styles->add( 'nav-menu', "/wp-admin/css/nav-menu$suffix.css", array(), '20100301' );
+	$styles->add( 'nav-menu', "/wp-admin/css/nav-menu$suffix.css", array(), '20100322' );
 
 	foreach ( $rtl_styles as $rtl_style ) {
 		$styles->add_data( $rtl_style, 'rtl', true );