Index: wp-app.php
===================================================================
--- wp-app.php	(revision 10258)
+++ wp-app.php	(working copy)
@@ -1279,12 +1279,9 @@
 	 *
 	 * @since 2.6.0
 	 */
-	function forbidden($reason='') {
+	function forbidden( $reason = '' ) {
 		log_app('Status','403: Forbidden');
-		header('Content-Type: text/plain');
-		status_header('403');
-		echo $reason;
-		exit;
+		wp_die( $reason, __('Atom Feed'), array('response' => 403) );
 	}
 
 	/**