diff --git includes/bootstrap.inc includes/bootstrap.inc
index 8fe5bea..1c13c6f 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' => DRUPAL_ROOT);
+    $callbacks[] = array('callback' => $callback, 'arguments' => $args);
   }
   return $callbacks;
 }
@@ -3068,9 +3068,12 @@ function &drupal_register_shutdown_function($callback = NULL) {
 function _drupal_shutdown_function() {
   $callbacks = &drupal_register_shutdown_function();
 
+  // Set the CWD to DRUPAL_ROOT as it is not guaranteed to be the same as it
+  // was in the normal context of execution.
+  chdir(DRUPAL_ROOT);
+
   try {
     while (list($key, $callback) = each($callbacks)) {
-      chdir($callback['cwd']);
       call_user_func_array($callback['callback'], $callback['arguments']);
     }
   }