diff --git a/openerp/fields.py b/openerp/fields.py
index ede066e37fe..ce280418e77 100644
--- a/openerp/fields.py
+++ b/openerp/fields.py
@@ -1542,6 +1542,9 @@ class Id(Field):
     store = True
     readonly = True
 
+    def __init__(self, string=None, **kwargs):
+        super(Id, self).__init__(type='integer', string=string, **kwargs)
+
     def to_column(self):
         return fields.integer('ID')