diff --git a/mobile/shop/orderform.php b/mobile/shop/orderform.php
index 96d02c7d8..5d0f4eb58 100644
--- a/mobile/shop/orderform.php
+++ b/mobile/shop/orderform.php
@@ -908,7 +908,7 @@ $(function() {
     $("#od_coupon_btn").click(function() {
         $("#od_coupon_frm").remove();
         var $this = $(this);
-        var price = parseInt($("input[name=org_od_price]").val());
+        var price = parseInt($("input[name=org_od_price]").val()) - parseInt($("input[name=item_coupon]").val());
         $.post(
             "./ordercoupon.php",
             { price: price },
diff --git a/shop/orderform.php b/shop/orderform.php
index feae24756..1e736968e 100644
--- a/shop/orderform.php
+++ b/shop/orderform.php
@@ -1171,7 +1171,7 @@ $(function() {
     $("#od_coupon_btn").click(function() {
         $("#od_coupon_frm").remove();
         var $this = $(this);
-        var price = parseInt($("input[name=org_od_price]").val());
+        var price = parseInt($("input[name=org_od_price]").val()) - parseInt($("input[name=item_coupon]").val());
         $.post(
             "./ordercoupon.php",
             { price: price },