diff --git a/install/shop.sql b/install/shop.sql
index b3e49d8d0..f150a7fbe 100644
--- a/install/shop.sql
+++ b/install/shop.sql
@@ -69,6 +69,7 @@ CREATE TABLE IF NOT EXISTS `shop_cart` (
   `ct_option` varchar(255) NOT NULL DEFAULT '',
   `ct_qty` int(11) NOT NULL DEFAULT '0',
   `ct_num` int(11) NOT NULL DEFAULT '0',
+  `ct_notax` tinyint(4) NOT NULL DEFAULT '0',
   `io_id` varchar(255) NOT NULL DEFAULT '',
   `io_type` tinyint(4) NOT NULL DEFAULT '0',
   `io_price` int(11) NOT NULL DEFAULT '0',