diff --git includes/bootstrap.inc includes/bootstrap.inc
index be0a471..8fe5bea 100644
--- includes/bootstrap.inc
+++ includes/bootstrap.inc
@@ -3057,7 +3057,7 @@ function &drupal_register_shutdown_function($callback = NULL) {
     $args = func_get_args();
     array_shift($args);
     // Save callback and arguments
-    $callbacks[] = array('callback' => $callback, 'arguments' => $args, 'cwd' => getcwd());
+    $callbacks[] = array('callback' => $callback, 'arguments' => $args, 'cwd' => DRUPAL_ROOT);
   }
   return $callbacks;
 }