diff --git a/wp-commentsrss2.php b/wp-commentsrss2.php
index 5bd228c709..1ae2350f87 100644
--- a/wp-commentsrss2.php
+++ b/wp-commentsrss2.php
@@ -3,7 +3,7 @@ if (! $feed) {
     require('wp-blog-header.php');
 }
 
-header('Content-type: text/xml');
+header('Content-type: application/rss+xml', true);
 
 echo '<?xml version="1.0" encoding="'.get_settings('blog_charset').'"?'.'>'; 
 ?>