diff --git a/addons/sale/models/sale.py b/addons/sale/models/sale.py
index 8fb42672d1e..0836ec09673 100644
--- a/addons/sale/models/sale.py
+++ b/addons/sale/models/sale.py
@@ -461,7 +461,11 @@ class SaleOrder(models.Model):
             )
             price_unit = self.env['account.tax']._fix_tax_included_price_company(
                 line._get_display_price(product), line.product_id.taxes_id, line.tax_id, line.company_id)
-            lines_to_update.append((1, line.id, {'price_unit': price_unit}))
+            if self.pricelist_id.discount_policy == 'without_discount':
+                discount = max(0, (price_unit - product.price) * 100 / price_unit)
+            else:
+                discount = 0
+            lines_to_update.append((1, line.id, {'price_unit': price_unit, 'discount': discount}))
         self.update({'order_line': lines_to_update})
         self.show_update_pricelist = False
         self.message_post(body=_("Product prices have been recomputed according to pricelist <b>%s<b> ", self.pricelist_id.display_name))