diff --git a/keystoneclient/auth/identity/v2.py b/keystoneclient/auth/identity/v2.py
index db9562de0..1a6564f14 100644
--- a/keystoneclient/auth/identity/v2.py
+++ b/keystoneclient/auth/identity/v2.py
@@ -71,7 +71,7 @@ class Auth(base.BaseIdentityPlugin):
         self.tenant_name = tenant_name
 
     def get_auth_ref(self, session, **kwargs):
-        headers = {}
+        headers = {'Accept': 'application/json'}
         url = self.auth_url + '/tokens'
         params = {'auth': self.get_auth_data(headers)}
 
diff --git a/keystoneclient/auth/identity/v3.py b/keystoneclient/auth/identity/v3.py
index e49564e08..93299251c 100644
--- a/keystoneclient/auth/identity/v3.py
+++ b/keystoneclient/auth/identity/v3.py
@@ -66,7 +66,7 @@ class Auth(base.BaseIdentityPlugin):
         return '%s/auth/tokens' % self.auth_url.rstrip('/')
 
     def get_auth_ref(self, session, **kwargs):
-        headers = {}
+        headers = {'Accept': 'application/json'}
         body = {'auth': {'identity': {}}}
         ident = body['auth']['identity']
 
diff --git a/keystoneclient/tests/auth/test_identity_v2.py b/keystoneclient/tests/auth/test_identity_v2.py
index 16278e2c9..237291199 100644
--- a/keystoneclient/tests/auth/test_identity_v2.py
+++ b/keystoneclient/tests/auth/test_identity_v2.py
@@ -109,6 +109,8 @@ class V2IdentityPlugin(utils.TestCase):
         req = {'auth': {'passwordCredentials': {'username': self.TEST_USER,
                                                 'password': self.TEST_PASS}}}
         self.assertRequestBodyIs(json=req)
+        self.assertRequestHeaderEqual('Content-Type', 'application/json')
+        self.assertRequestHeaderEqual('Accept', 'application/json')
         self.assertEqual(s.auth.auth_ref.auth_token, self.TEST_TOKEN)
 
     @httpretty.activate
@@ -135,6 +137,8 @@ class V2IdentityPlugin(utils.TestCase):
         req = {'auth': {'token': {'id': 'foo'}}}
         self.assertRequestBodyIs(json=req)
         self.assertRequestHeaderEqual('x-Auth-Token', 'foo')
+        self.assertRequestHeaderEqual('Content-Type', 'application/json')
+        self.assertRequestHeaderEqual('Accept', 'application/json')
         self.assertEqual(s.auth.auth_ref.auth_token, self.TEST_TOKEN)
 
     def test_missing_auth_params(self):
diff --git a/keystoneclient/tests/auth/test_identity_v3.py b/keystoneclient/tests/auth/test_identity_v3.py
index efb2d39d0..ca51ef7c2 100644
--- a/keystoneclient/tests/auth/test_identity_v3.py
+++ b/keystoneclient/tests/auth/test_identity_v3.py
@@ -165,6 +165,8 @@ class V3IdentityPlugin(utils.TestCase):
                                       'password': self.TEST_PASS}}}}}
 
         self.assertRequestBodyIs(json=req)
+        self.assertRequestHeaderEqual('Content-Type', 'application/json')
+        self.assertRequestHeaderEqual('Accept', 'application/json')
         self.assertEqual(s.auth.auth_ref.auth_token, self.TEST_TOKEN)
 
     @httpretty.activate
@@ -213,6 +215,9 @@ class V3IdentityPlugin(utils.TestCase):
                 'token': {'id': self.TEST_TOKEN}}}}
 
         self.assertRequestBodyIs(json=req)
+
+        self.assertRequestHeaderEqual('Content-Type', 'application/json')
+        self.assertRequestHeaderEqual('Accept', 'application/json')
         self.assertEqual(s.auth.auth_ref.auth_token, self.TEST_TOKEN)
 
     def test_missing_auth_params(self):