diff --git a/addons/stock/stock.py b/addons/stock/stock.py
index 5d111d04e47..e87c3d36db1 100644
--- a/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@ -556,7 +556,7 @@ class stock_picking(osv.osv):
         for pick in self.browse(cr, uid, ids, context=context):            
             res[pick.id] = False
             for move in pick.move_lines:
-                if len(move.reserved_quant_ids):
+                if move.reserved_quant_ids:
                     res[pick.id] = True        
         return res