diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 87dad9b4..a31091f5 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -1574,7 +1574,7 @@ class ShopController extends BaseAuthedController
         $ret_price = phpcommon\bnDiv(phpcommon\bnMul($bn1, $bn2), pow(10, 8));
 
         error_log('normalizeWeb3Price: ' . $ret_price . ' ' . $price * pow(10, 8));
-        return $ret_price;
+        return phpcommon\bnToStr($ret_price);
     }
 
     private function countFreeBuyTimes($goods) {