diff --git a/bio_login/models/res_users.py b/bio_login/models/res_users.py
index 182b995..92fdef2 100644
--- a/bio_login/models/res_users.py
+++ b/bio_login/models/res_users.py
@@ -53,9 +53,9 @@ def fingerprint(self):
                 transaction, 'Odoo', self.id)['outBioKey']
             self.biokey = biokey
 
-    @classmethod
-    def _login(cls, db, login, password):
-        user_id = super(ResUsers, cls)._login(db, login, password)
+    def _login(self, db, login, password):
+        user_id = super(ResUsers, self)._login(db, login, password)
+        import ipdb; ipdb.set_trace()
         if user_id == SUPERUSER_ID:
             return user_id
         with registry(db).cursor() as cr: