diff --git a/bin/addons/base/ir/ir_rule.py b/bin/addons/base/ir/ir_rule.py
index fe32664c1ca..657dc65a12a 100644
--- a/bin/addons/base/ir/ir_rule.py
+++ b/bin/addons/base/ir/ir_rule.py
@@ -55,8 +55,8 @@ class ir_rule(osv.osv):
         'model_id': fields.many2one('ir.model', 'Object',select=1, required=True),
         'global': fields.function(_get_value, method=True, string='Global', type='boolean', store=True, help="If no group is specified the rule is global and applied to everyone"),
         'groups': fields.many2many('res.groups', 'rule_group_rel', 'rule_group_id', 'group_id', 'Groups'),
-        'domain_force': fields.char('Domain', size=250),
-        'domain': fields.function(_domain_force_get, method=True, string='Domain', type='char', size=250),
+        'domain_force': fields.text('Domain'),
+        'domain': fields.function(_domain_force_get, method=True, string='Domain', type='text'),
         'perm_read': fields.boolean('Apply For Read'),
         'perm_write': fields.boolean('Apply For Write'),
         'perm_create': fields.boolean('Apply For Create'),