diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index d37a98e..79f6f00 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -498,7 +498,7 @@ function drupal_environment_initialize() {
   ini_set('session.use_only_cookies', '1');
   ini_set('session.use_trans_sid', '0');
   // Don't send HTTP headers using PHP's session handler.
-  ini_set('session.cache_limiter', 'none');
+  ini_set('session.cache_limiter', '');
   // Use httponly session cookies.
   ini_set('session.cookie_httponly', '1');