diff --git a/gerrit_util.py b/gerrit_util.py
index b5fb18d94..a03925898 100644
--- a/gerrit_util.py
+++ b/gerrit_util.py
@@ -275,7 +275,7 @@ class Authenticator(object):
                     if skip_sso:
                         LOGGER.debug(
                             'Authenticator.get: skipping SSOAuthenticator.')
-                        authenticators = authenticators[1:]
+                        a = a[1:]
                     ret = ChainedAuthenticator(a)
                 cls._resolved = ret
                 return ret