diff --git a/addons/auth_signup/controllers/main.py b/addons/auth_signup/controllers/main.py
index 3040fafaf2b..91326d5d530 100644
--- a/addons/auth_signup/controllers/main.py
+++ b/addons/auth_signup/controllers/main.py
@@ -114,6 +114,7 @@ class AuthSignupHome(openerp.addons.web.controllers.main.Home):
         values = dict((key, qcontext.get(key)) for key in ('login', 'name', 'password'))
         assert any([k for k in values.values()]), "The form was not properly filled in."
         assert values.get('password') == qcontext.get('confirm_password'), "Passwords do not match; please retype them."
+        values['lang'] = request.lang
         self._signup_with_values(qcontext.get('token'), values)
         request.cr.commit()