diff --git a/addons/auth_crypt/auth_crypt.py b/addons/auth_crypt/auth_crypt.py
index a7e3a826223..9724b511a05 100644
--- a/addons/auth_crypt/auth_crypt.py
+++ b/addons/auth_crypt/auth_crypt.py
@@ -22,7 +22,8 @@ _logger = logging.getLogger(__name__)
 magic_md5 = '$1$'
 magic_sha256 = '$5$'
 
-openerp.addons.base.res.res_users.USER_PRIVATE_FIELDS.append('password_crypt')
+from openerp.addons.base.res import res_users
+res_users.USER_PRIVATE_FIELDS.append('password_crypt')
 
 def gen_salt(length=8, symbols=None):
     if symbols is None: