diff --git a/gulliver/system/class.bootstrap.php b/gulliver/system/class.bootstrap.php
index 5b8de974d..367304ecb 100644
--- a/gulliver/system/class.bootstrap.php
+++ b/gulliver/system/class.bootstrap.php
@@ -1273,7 +1273,7 @@ class Bootstrap
         $checkSum = '';
         foreach ($files as $file) {
             if (is_file($file)) {
-                $checkSum .= G::encryptFileOld($file);
+                $checkSum .= Bootstrap::encryptFileOld($file);
             }
         }
         return Bootstrap::encryptOld($checkSum . $key);