Index: includes/language.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/language.inc,v
retrieving revision 1.19
diff -u -p -r1.19 language.inc
--- includes/language.inc	1 Feb 2009 16:45:53 -0000	1.19
+++ includes/language.inc	4 Oct 2009 11:36:36 -0000
@@ -106,7 +106,7 @@ function language_url_rewrite(&$path, &$
   global $language;
 
   // Only modify relative (insite) URLs.
-  if (!$options['external']) {
+  if (empty($options['external'])) {
 
     // Language can be passed as an option, or we go for current language.
     if (!isset($options['language'])) {