diff --git a/move.py b/move.py
index ccee0b4db9..fdff042f6e 100644
--- a/move.py
+++ b/move.py
@@ -74,7 +74,7 @@ class Move(metaclass=PoolMeta):
         # Compute average cost price
         unit_price = self.unit_price
         self.unit_price = Uom.compute_price(
-            move.product.default_uom, cost_price, self.uom)
+            self.product.default_uom, cost_price, self.uom)
         average_cost_price = self._compute_product_cost_price('out')
         self.unit_price = unit_price