Index: wp-admin/includes/export.php
===================================================================
--- wp-admin/includes/export.php	(revision 19794)
+++ wp-admin/includes/export.php	(working copy)
@@ -321,7 +321,6 @@
 <rss version="2.0"
 	xmlns:excerpt="http://wordpress.org/export/<?php echo WXR_VERSION; ?>/excerpt/"
 	xmlns:content="http://purl.org/rss/1.0/modules/content/"
-	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
 	xmlns:wp="http://wordpress.org/export/<?php echo WXR_VERSION; ?>/"
 >