diff --git a/services/cart/Coupon.php b/services/cart/Coupon.php
index 3c0671761c425ac348542a97d3316e2f1e774d56..6022aeba1761fe2348f4947c5b327f48599b080c 100644
--- a/services/cart/Coupon.php
+++ b/services/cart/Coupon.php
@@ -54,7 +54,7 @@ class Coupon extends Service
         if ($one[$primaryKey]) {
             return $one;
         } else {
-            return new $this->_couponModel;
+            return new $this->_couponModelName;
         }
     }
     /**