diff --git a/sites/default/default.settings.php b/sites/default/default.settings.php
index 83548f4..5736d6e 100755
--- a/sites/default/default.settings.php
+++ b/sites/default/default.settings.php
@@ -482,7 +482,7 @@ ini_set('session.cookie_lifetime', 2000000);
  */
 $conf['404_fast_paths_exclude'] = '/\/(?:styles)\//';
 $conf['404_fast_paths'] = '/\.(?:txt|png|gif|jpe?g|css|js|ico|swf|flv|cgi|bat|pl|dll|exe|asp)$/i';
-$conf['404_fast_html'] = '<html xmlns="http://www.w3.org/1999/xhtml"><head><title>404 Not Found</title></head><body><h1>Not Found</h1><p>The requested URL "@path" was not found on this server.</p></body></html>';
+$conf['404_fast_html'] = '<!doctype html><html><head><title>404 Not Found</title></head><body><h1>Not Found</h1><p>The requested URL "@path" was not found on this server.</p></body></html>';
 
 /**
  * By default, fast 404s are returned as part of the normal page request
