diff --git a/openerp/osv/fields.py b/openerp/osv/fields.py
index 0ca684253b5..e9c2c38f97c 100644
--- a/openerp/osv/fields.py
+++ b/openerp/osv/fields.py
@@ -151,6 +151,8 @@ class _column(object):
 
     def __getattr__(self, name):
         """ Access a non-slot attribute. """
+        if name == '_args':
+            raise AttributeError(name)
         try:
             return self._args[name]
         except KeyError: