diff --git a/addons/sale/models/sale.py b/addons/sale/models/sale.py
index aa9e1102da1..2df7f0d9f23 100644
--- a/addons/sale/models/sale.py
+++ b/addons/sale/models/sale.py
@@ -1642,7 +1642,7 @@ class SaleOrderLine(models.Model):
             )
 
         if self.order_id.pricelist_id.discount_policy == 'with_discount':
-            return product.with_context(pricelist=self.order_id.pricelist_id.id).price
+            return product.with_context(pricelist=self.order_id.pricelist_id.id, uom=self.product_uom.id).price
         product_context = dict(self.env.context, partner_id=self.order_id.partner_id.id, date=self.order_id.date_order, uom=self.product_uom.id)
 
         final_price, rule_id = self.order_id.pricelist_id.with_context(product_context).get_product_price_rule(product or self.product_id, self.product_uom_qty or 1.0, self.order_id.partner_id)