Index: wordpress/wp-includes/feed-rss2.php
===================================================================
--- wordpress/wp-includes/feed-rss2.php	(revision 153509)
+++ wordpress/wp-includes/feed-rss2.php	(working copy)
@@ -37,7 +37,7 @@
 		<comments><?php comments_link_feed(); ?></comments>
 		<pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_post_time('Y-m-d H:i:s', true), false); ?></pubDate>
 		<dc:creator><?php the_author() ?></dc:creator>
-		<?php the_category_rss() ?>
+		<?php the_category_rss('rss2') ?>
 
 		<guid isPermaLink="false"><?php the_guid(); ?></guid>
 <?php if (get_option('rss_use_excerpt')) : ?>