diff --git a/oidc_provider/lib/endpoints/token.py b/oidc_provider/lib/endpoints/token.py
index c6b96b0..8c32046 100644
--- a/oidc_provider/lib/endpoints/token.py
+++ b/oidc_provider/lib/endpoints/token.py
@@ -1,3 +1,4 @@
+import inspect
 from base64 import urlsafe_b64encode
 import hashlib
 import logging
@@ -96,7 +97,14 @@ class TokenEndpoint(object):
             if not settings.get('OIDC_GRANT_TYPE_PASSWORD_ENABLE'):
                 raise TokenError('unsupported_grant_type')
 
+            auth_args = (self.request,)
+            try:
+                inspect.getcallargs(authenticate, *auth_args)
+            except TypeError:
+                auth_args = ()
+
             user = authenticate(
+                *auth_args,
                 username=self.params['username'],
                 password=self.params['password']
             )
diff --git a/oidc_provider/tests/app/utils.py b/oidc_provider/tests/app/utils.py
index fdee81c..457757d 100644
--- a/oidc_provider/tests/app/utils.py
+++ b/oidc_provider/tests/app/utils.py
@@ -1,5 +1,9 @@
 import random
 import string
+
+import django
+from django.contrib.auth.backends import ModelBackend
+
 try:
     from urlparse import parse_qs, urlsplit
 except ImportError:
@@ -131,3 +135,10 @@ def fake_idtoken_processing_hook2(id_token, user):
 def fake_introspection_processing_hook(response_dict, client, id_token):
     response_dict['test_introspection_processing_hook'] = FAKE_RANDOM_STRING
     return response_dict
+
+
+class TestAuthBackend:
+    def authenticate(self, *args, **kwargs):
+        if django.VERSION[0] >= 2 or (django.VERSION[0] == 1 and django.VERSION[1] >= 11):
+            assert len(args) > 0 and args[0]
+        return ModelBackend().authenticate(*args, **kwargs)
diff --git a/oidc_provider/tests/cases/test_token_endpoint.py b/oidc_provider/tests/cases/test_token_endpoint.py
index 5c787b3..0646046 100644
--- a/oidc_provider/tests/cases/test_token_endpoint.py
+++ b/oidc_provider/tests/cases/test_token_endpoint.py
@@ -3,6 +3,7 @@ import time
 import uuid
 
 from base64 import b64encode
+
 try:
     from urllib.parse import urlencode
 except ImportError:
@@ -256,6 +257,17 @@ class TokenTestCase(TestCase):
             else:
                 self.assertNotIn(claim, userinfo)
 
+    @override_settings(OIDC_GRANT_TYPE_PASSWORD_ENABLE=True,
+                       AUTHENTICATION_BACKENDS=("oidc_provider.tests.app.utils.TestAuthBackend",))
+    def test_password_grant_passes_request_to_backend(self):
+        response = self._post_request(
+            post_data=self._password_grant_post_data(),
+            extras=self._password_grant_auth_header()
+        )
+
+        response_dict = json.loads(response.content.decode('utf-8'))
+        self.assertIn('access_token', response_dict)
+
     @override_settings(OIDC_TOKEN_EXPIRE=720)
     def test_authorization_code(self):
         """