diff --git a/includes/language.inc b/includes/language.inc
index 45fbf9c6269f..6da93966ee2c 100644
--- a/includes/language.inc
+++ b/includes/language.inc
@@ -25,7 +25,7 @@ function language_initialize() {
     case LANGUAGE_NEGOTIATION_DOMAIN:
       foreach ($languages as $language) {
         $parts = parse_url($language->domain);
-        if (!empty($parts['host']) && ($_SERVER['SERVER_NAME'] == $parts['host'])) {
+        if (!empty($parts['host']) && ($_SERVER['HTTP_HOST'] == $parts['host'])) {
           return $language;
         }
       }