diff --git a/wp-admin/includes/media.php b/wp-admin/includes/media.php
index d59aba3d92..ce24cd06a3 100644
--- a/wp-admin/includes/media.php
+++ b/wp-admin/includes/media.php
@@ -319,7 +319,8 @@ wp_enqueue_style( 'ie' );
 //<![CDATA[
 addLoadEvent = function(func){if(typeof jQuery!="undefined")jQuery(document).ready(func);else if(typeof wpOnload!='function'){wpOnload=func;}else{var oldonload=wpOnload;wpOnload=function(){oldonload();func();}}};
 var userSettings = {'url':'<?php echo SITECOOKIEPATH; ?>','uid':'<?php if ( ! isset($current_user) ) $current_user = wp_get_current_user(); echo $current_user->ID; ?>','time':'<?php echo time(); ?>'};
-var ajaxurl = '<?php echo admin_url('admin-ajax.php'); ?>', pagenow = 'media-upload-popup', adminpage = 'media-upload-popup';
+var ajaxurl = '<?php echo admin_url('admin-ajax.php'); ?>', pagenow = 'media-upload-popup', adminpage = 'media-upload-popup',
+isRtl = <?php echo (int) is_rtl(); ?>;
 //]]>
 </script>
 <?php