diff --git a/addons/stock/stock.py b/addons/stock/stock.py
index 56c0d3a6f3b..f8ad42c66fa 100644
--- a/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@ -1768,7 +1768,7 @@ class stock_move(osv.osv):
         """ Confirms stock move or put it in waiting if it's linked to another move.
         @return: List of ids.
         """
-        if isinstance(ids, ('int', 'long')):
+        if isinstance(ids, (int, long)):
             ids = [ids]
         states = {
             'confirmed': [],