diff --git a/openerp/addons/base/res/res_users.py b/openerp/addons/base/res/res_users.py
index 2617efeb4a2..42d5051cc29 100644
--- a/openerp/addons/base/res/res_users.py
+++ b/openerp/addons/base/res/res_users.py
@@ -243,7 +243,7 @@ class users(osv.osv):
                                 string='Set password', help="Specify a value only when creating a user or if you're changing the user's password, "
                                                             "otherwise leave empty. After a change of password, the user has to login again."),
         'user_email': fields.char('Email', size=64),
-        'signature': fields.text('Signature', size=64),
+        'signature': fields.text('Signature'),
         'active': fields.boolean('Active'),
         'action_id': fields.many2one('ir.actions.actions', 'Home Action', help="If specified, this action will be opened at logon for this user, in addition to the standard menu."),
         'menu_id': fields.many2one('ir.actions.actions', 'Menu Action', help="If specified, the action will replace the standard menu for this user."),