diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index a5f63723..7da0ee8e 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -129,7 +129,7 @@ class ShopController extends BaseAuthedController {
         }
 
         $costItemId = $this->getCostItemIdByTokenType($tokenType);
-        $costItems = $this->makeCostItems($costItemId, $goodsNum * $need_price);
+        $costItems = $this->makeCostItems($costItemId, $goodsNum * $needPrice);
         if (!in_array(
             $tokenType,
             array(