diff --git a/classes/Cart.php b/classes/Cart.php
index 20e054548..1d4c0b724 100644
--- a/classes/Cart.php
+++ b/classes/Cart.php
@@ -369,7 +369,7 @@ class CartCore extends ObjectModel
 			{
 				$row['price'] = Product::getPriceStatic((int)$row['id_product'], false, isset($row['id_product_attribute']) ? (int)($row['id_product_attribute']) : NULL, 2, NULL, false, true, (int)($row['cart_quantity']), false, ((int)($this->id_customer) ? (int)($this->id_customer) : NULL), (int)($this->id), ((int)($this->{Configuration::get('PS_TAX_ADDRESS_TYPE')}) ? (int)($this->{Configuration::get('PS_TAX_ADDRESS_TYPE')}) : NULL), $specificPriceOutput); // Here taxes are computed only once the quantity has been applied to the product price
 				$row['price_wt'] = Product::getPriceStatic((int)$row['id_product'], true, isset($row['id_product_attribute']) ? (int)($row['id_product_attribute']) : NULL, 2, NULL, false, true, (int)($row['cart_quantity']), false, ((int)($this->id_customer) ? (int)($this->id_customer) : NULL), (int)($this->id), ((int)($this->{Configuration::get('PS_TAX_ADDRESS_TYPE')}) ? (int)($this->{Configuration::get('PS_TAX_ADDRESS_TYPE')}) : NULL));
-                $tax_rate = Tax::getProductTaxRate((int)$id_product, (int)($this->{Configuration::get('PS_TAX_ADDRESS_TYPE')}));
+                $tax_rate = Tax::getProductTaxRate((int)$row['id_product'], (int)($this->{Configuration::get('PS_TAX_ADDRESS_TYPE')}));
 				$row['total_wt'] = Tools::ps_round($row['price'] * (float)$row['cart_quantity'] * (1 + (float)($tax_rate) / 100), 2);
 				$row['total'] = $row['price'] * (int)($row['cart_quantity']);
 			}