diff --git a/addons/stock/stock.py b/addons/stock/stock.py
index 885f7cd2077..d26ca8f0da3 100644
--- a/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@ -2165,7 +2165,7 @@ class stock_move(osv.osv):
                 context = {}
             currency_ctx = dict(context, currency_id = move.company_id.currency_id.id)
             amount_unit = move.product_id.price_get('standard_price', context=currency_ctx)[move.product_id.id]
-            reference_amount = amount_unit * qty or 1.0
+            reference_amount = amount_unit * qty
 
         return reference_amount, reference_currency_id