diff --git a/addons/stock/stock.py b/addons/stock/stock.py
index 85aec0ccb29..0722a70125f 100644
--- a/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@ -2520,7 +2520,7 @@ class stock_inventory(osv.osv):
 
     }
     _defaults = {
-        'date': time.strftime('%Y-%m-%d %H:%M:%S'),
+        'date': lambda *a: time.strftime('%Y-%m-%d %H:%M:%S'),
         'state': 'draft',
         'company_id': lambda self,cr,uid,c: self.pool.get('res.company')._company_default_get(cr, uid, 'stock.inventory', context=c)
     }