diff --git src/wp-includes/script-loader.php src/wp-includes/script-loader.php
index e95d075..9304d2d 100644
--- src/wp-includes/script-loader.php
+++ src/wp-includes/script-loader.php
@@ -408,12 +408,12 @@ function wp_default_scripts( &$scripts ) {
 
 	$scripts->add( 'hoverIntent', "/wp-includes/js/hoverIntent$suffix.js", array('jquery'), '1.8.1', 1 );
 
-	$scripts->add( 'customize-base',     "/wp-includes/js/customize-base$suffix.js",     array( 'jquery', 'json2', 'underscore', 'wp-a11y' ), false, 1 );
+	$scripts->add( 'customize-base',     "/wp-includes/js/customize-base$suffix.js",     array( 'jquery', 'json2', 'underscore' ), false, 1 );
 	$scripts->add( 'customize-loader',   "/wp-includes/js/customize-loader$suffix.js",   array( 'customize-base' ), false, 1 );
 	$scripts->add( 'customize-preview',  "/wp-includes/js/customize-preview$suffix.js",  array( 'customize-base' ), false, 1 );
 	$scripts->add( 'customize-models',   "/wp-includes/js/customize-models.js", array( 'underscore', 'backbone' ), false, 1 );
 	$scripts->add( 'customize-views',    "/wp-includes/js/customize-views.js",  array( 'jquery', 'underscore', 'imgareaselect', 'customize-models', 'media-editor', 'media-views' ), false, 1 );
-	$scripts->add( 'customize-controls', "/wp-admin/js/customize-controls$suffix.js", array( 'customize-base' ), false, 1 );
+	$scripts->add( 'customize-controls', "/wp-admin/js/customize-controls$suffix.js", array( 'customize-base', 'wp-a11y' ), false, 1 );
 	did_action( 'init' ) && $scripts->localize( 'customize-controls', '_wpCustomizeControlsL10n', array(
 		'activate'           => __( 'Save & Activate' ),
 		'save'               => __( 'Save & Publish' ),
@@ -433,7 +433,7 @@ function wp_default_scripts( &$scripts ) {
 	$scripts->add( 'customize-widgets', "/wp-admin/js/customize-widgets$suffix.js", array( 'jquery', 'jquery-ui-sortable', 'jquery-ui-droppable', 'wp-backbone', 'customize-controls' ), false, 1 );
 	$scripts->add( 'customize-preview-widgets', "/wp-includes/js/customize-preview-widgets$suffix.js", array( 'jquery', 'wp-util', 'customize-preview' ), false, 1 );
 
-	$scripts->add( 'customize-nav-menus', "/wp-admin/js/customize-nav-menus$suffix.js", array( 'jquery', 'wp-backbone', 'customize-controls', 'accordion', 'nav-menu', 'wp-a11y' ), false, 1 );
+	$scripts->add( 'customize-nav-menus', "/wp-admin/js/customize-nav-menus$suffix.js", array( 'jquery', 'wp-backbone', 'customize-controls', 'accordion', 'nav-menu' ), false, 1 );
 	$scripts->add( 'customize-preview-nav-menus', "/wp-includes/js/customize-preview-nav-menus$suffix.js", array( 'jquery', 'wp-util', 'customize-preview' ), false, 1 );
 
 	$scripts->add( 'accordion', "/wp-admin/js/accordion$suffix.js", array( 'jquery' ), false, 1 );