diff --git a/operation.py b/operation.py
index 640cb95..8220e1d 100644
--- a/operation.py
+++ b/operation.py
@@ -355,7 +355,8 @@ class Production(metaclass=PoolMeta):
         return cost
 
     @classmethod
-    def compute_request(cls, product, warehouse, quantity, date, company):
+    def compute_request(cls, product, warehouse, quantity, date, company,
+            order_point=None):
         "Inherited from stock_supply_production"
         production = super(Production, cls).compute_request(product,
             warehouse, quantity, date, company)