Index: wp-includes/feed.php
===================================================================
--- wp-includes/feed.php	(revision 6124)
+++ wp-includes/feed.php	(working copy)
@@ -171,7 +171,7 @@
 		elseif ( 'atom' == $type )
 			$the_list .= sprintf( '<category scheme="%1$s" term="%2$s" />', attribute_escape( apply_filters( 'get_bloginfo_rss', get_bloginfo( 'url' ) ) ), attribute_escape( $cat_name ) );
 		else
-			$the_list .= "\n\t\t<category><![CDATA[$cat_name]]></category>\n";
+			$the_list .= "\n\t\t<category><![CDATA[".ent2ncr($cat_name)."]]></category>\n";
 	}
 
 	return apply_filters('the_category_rss', $the_list, $type);