diff --git a/wp-includes/rss.php b/wp-includes/rss.php
index 44c9f5cc41..ac747a2d9a 100644
--- a/wp-includes/rss.php
+++ b/wp-includes/rss.php
@@ -11,7 +11,7 @@ do_action('load_feed_engine');
 
 define('RSS', 'RSS');
 define('ATOM', 'Atom');
-define('MAGPIE_USER_AGENT', 'WordPress/' . $wp_version);
+define('MAGPIE_USER_AGENT', 'WordPress/' . $GLOBALS['wp_version']);
 
 class MagpieRSS {
 	var $parser;
@@ -595,7 +595,7 @@ function init () {
 	}
 
 	if ( !defined('MAGPIE_USER_AGENT') ) {
-		$ua = 'WordPress/' . $wp_version;
+		$ua = 'WordPress/' . $GLOBALS['wp_version'];
 
 		if ( MAGPIE_CACHE_ON ) {
 			$ua = $ua . ')';