diff --git a/Cloner/VarCloner.php b/Cloner/VarCloner.php
index f02a59d5..b5bd252f 100644
--- a/Cloner/VarCloner.php
+++ b/Cloner/VarCloner.php
@@ -45,7 +45,7 @@ protected function doClone($var)
                                         // or null if the original value is used directly
 
         if (!$gid = self::$gid) {
-            $gid = self::$gid = uniqid(mt_rand(), true); // Unique string used to detect the special $GLOBALS variable
+            $gid = self::$gid = md5(random_bytes(6)); // Unique string used to detect the special $GLOBALS variable
         }
         $arrayStub = new Stub();
         $arrayStub->type = Stub::TYPE_ARRAY;