diff --git a/product.py b/product.py
index 72a3dd9c5e..f7f5f0b717 100644
--- a/product.py
+++ b/product.py
@@ -53,8 +53,8 @@ class PriceList(metaclass=PoolMeta):
 
     def get_uom(self, product):
         uom = super().get_uom(product)
-        if self.unit == 'product_sale' and self.product.sale_uom:
-            uom = self.product.sale_uom
+        if self.unit == 'product_sale' and product.sale_uom:
+            uom = product.sale_uom
         return uom