From 8ff3ad7903ffe0216d5c3e09e3b70a8abbe3c82a Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Tue, 22 May 2012 20:34:45 +0000
Subject: [PATCH] Don't concatenate. see #19910

git-svn-id: https://develop.svn.wordpress.org/trunk@20845 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-admin/admin-header.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wp-admin/admin-header.php b/wp-admin/admin-header.php
index fa350623ca..8cb315284b 100644
--- a/wp-admin/admin-header.php
+++ b/wp-admin/admin-header.php
@@ -102,7 +102,7 @@ $admin_body_class .= ' no-customize-support';
 // This prevents a flash of unstyled content.
 if ( wp_script_is( 'customize-loader', 'queue' ) ) : ?>
 	if ( window.postMessage )
-		document.body.className += document.body.className.replace('no-customize-support','customize-support');
+		document.body.className = document.body.className.replace('no-customize-support','customize-support');
 <?php endif; ?>
 </script>