diff --git a/wp-admin/includes/export.php b/wp-admin/includes/export.php
index 79d822a476..daf9dc4499 100644
--- a/wp-admin/includes/export.php
+++ b/wp-admin/includes/export.php
@@ -233,6 +233,7 @@ echo '<?xml version="1.0" encoding="' . get_bloginfo('charset') . '"?' . ">\n";
 
 <?php the_generator('export');?>
 <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/"