diff --git a/addons/point_of_sale/models/pos_order.py b/addons/point_of_sale/models/pos_order.py
index 22d924dcfc6..81399d6d431 100644
--- a/addons/point_of_sale/models/pos_order.py
+++ b/addons/point_of_sale/models/pos_order.py
@@ -190,6 +190,7 @@ class PosOrder(models.Model):
             'price_unit': order_line.price_unit,
             'name': order_line.product_id.display_name,
             'tax_ids': [(6, 0, order_line.tax_ids.ids)],
+            'product_uom_id': order_line.product_uom_id.id,
         }
 
     def _get_pos_anglo_saxon_price_unit(self, product, partner_id, quantity):