diff --git a/keystoneauth1/extras/kerberos/__init__.py b/keystoneauth1/extras/kerberos/__init__.py
index 1092910c..6ae3ebde 100644
--- a/keystoneauth1/extras/kerberos/__init__.py
+++ b/keystoneauth1/extras/kerberos/__init__.py
@@ -75,9 +75,11 @@ class MappedKerberos(federation.FederationBaseAuth):
     use the standard keystone auth process to scope that to any given project.
     """
 
-    def __init__(self, *args, **kwargs):
+    def __init__(self, auth_url, identity_provider, protocol, **kwargs):
         _dependency_check()
-        super(MappedKerberos, self).__init__(*args, **kwargs)
+
+        super(MappedKerberos, self).__init__(auth_url, identity_provider,
+                                             protocol, **kwargs)
 
     def get_unscoped_auth_ref(self, session, **kwargs):
         resp = session.get(self.federated_token_url,
diff --git a/keystoneauth1/extras/kerberos/_loading.py b/keystoneauth1/extras/kerberos/_loading.py
index 797a18a6..6925ad8e 100644
--- a/keystoneauth1/extras/kerberos/_loading.py
+++ b/keystoneauth1/extras/kerberos/_loading.py
@@ -25,7 +25,7 @@ class Kerberos(loading.BaseV3Loader):
         return kerberos.requests_kerberos is not None
 
 
-class MappedKerberos(loading.BaseV3Loader):
+class MappedKerberos(loading.BaseFederationLoader):
 
     @property
     def plugin_class(self):
diff --git a/keystoneauth1/tests/unit/extras/kerberos/test_fedkerb_loading.py b/keystoneauth1/tests/unit/extras/kerberos/test_fedkerb_loading.py
index 2b189fcc..874543c8 100644
--- a/keystoneauth1/tests/unit/extras/kerberos/test_fedkerb_loading.py
+++ b/keystoneauth1/tests/unit/extras/kerberos/test_fedkerb_loading.py
@@ -10,6 +10,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+from keystoneauth1 import exceptions
 from keystoneauth1 import loading
 from keystoneauth1.tests.unit import utils as test_utils
 
@@ -22,12 +23,26 @@ class FedKerbLoadingTests(test_utils.TestCase):
 
         allowed_opts = ['domain-id',
                         'domain-name',
+                        'identity-provider',
                         'project-id',
                         'project-name',
                         'project-domain-id',
                         'project-domain-name',
+                        'protocol',
                         'trust-id',
                         'auth-url',
                         ]
 
         self.assertItemsEqual(allowed_opts, opts)
+
+    def create(self, **kwargs):
+        loader = loading.get_plugin_loader('v3fedkerb')
+        return loader.load_from_options(**kwargs)
+
+    def test_load_none(self):
+        self.assertRaises(exceptions.MissingRequiredOptions, self.create)
+
+    def test_load(self):
+        self.create(auth_url='auth_url',
+                    identity_provider='idp',
+                    protocol='protocol')