diff --git a/webapp/controller/MarketController.class.php b/webapp/controller/MarketController.class.php
index 845b7cd2..7173722f 100644
--- a/webapp/controller/MarketController.class.php
+++ b/webapp/controller/MarketController.class.php
@@ -483,7 +483,7 @@ class MarketController extends BaseController {
     {
         $account = getReqVal('account', '');
         $token = getReqVal('token', '');
-        $nonce = myself()->_getNowTime();
+        $nonce = uniqid() . '_' . myself()->_getNowTime();
         myself()->_rspData(array(
             'state' => $this->isValidToken($account, $token) ? 1 : 0,
             'nonce' => $nonce,