diff --git a/addons/auth_signup/models/res_partner.py b/addons/auth_signup/models/res_partner.py
index 302d69f173e..0cf5c25b7ff 100644
--- a/addons/auth_signup/models/res_partner.py
+++ b/addons/auth_signup/models/res_partner.py
@@ -104,7 +104,7 @@ class ResPartner(models.Model):
         """
         res = defaultdict(dict)
 
-        allow_signup = self.env['ir.config_parameter'].get_param('auth_signup.allow_uninvited', 'False').lower() == 'true'
+        allow_signup = self.env['ir.config_parameter'].sudo().get_param('auth_signup.allow_uninvited', 'False').lower() == 'true'
         for partner in self:
             if allow_signup and not partner.user_ids:
                 partner.signup_prepare()