diff --git a/classes/Product.php b/classes/Product.php
index 4c32d433f..d253d87f7 100644
--- a/classes/Product.php
+++ b/classes/Product.php
@@ -2470,7 +2470,7 @@ class ProductCore extends ObjectModel
 		if ((int)$id_cart)
 		{
 			$condition = '';
-			$cache_name = (int)$id_cart.'_'.(int)$id_product.'_'.(int)$id_product_attribute;
+			$cache_name = (int)$id_cart.'_'.(int)$id_product;
 			if (!isset(self::$_cart_quantity[$cache_name]) || self::$_cart_quantity[$cache_name] != (int)$quantity)
 				self::$_cart_quantity[$cache_name] = Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
 				SELECT SUM(`quantity`)