diff --git a/rally/plugins/openstack/verification/tempest/config.py b/rally/plugins/openstack/verification/tempest/config.py
index 762d68d1..dc861378 100644
--- a/rally/plugins/openstack/verification/tempest/config.py
+++ b/rally/plugins/openstack/verification/tempest/config.py
@@ -87,7 +87,7 @@ class TempestConfigfileManager(object):
     """Class to create a Tempest config file."""
 
     def __init__(self, deployment):
-        self.credential = deployment["admin"]
+        self.credential = deployment.get_credentials_for("openstack")["admin"]
         self.clients = osclients.Clients(objects.Credential(**self.credential))
         self.available_services = self.clients.services().values()
 
diff --git a/rally/plugins/openstack/verification/tempest/context.py b/rally/plugins/openstack/verification/tempest/context.py
index f3912f93..c8a1022c 100644
--- a/rally/plugins/openstack/verification/tempest/context.py
+++ b/rally/plugins/openstack/verification/tempest/context.py
@@ -44,8 +44,8 @@ class TempestContext(context.VerifierContext):
     def __init__(self, ctx):
         super(TempestContext, self).__init__(ctx)
 
-        credential = self.verifier.deployment["admin"]
-        self.clients = osclients.Clients(objects.Credential(**credential))
+        creds = self.verifier.deployment.get_credentials_for("openstack")
+        self.clients = osclients.Clients(objects.Credential(**creds["admin"]))
         self.available_services = self.clients.services().values()
 
         self.conf = configparser.ConfigParser()
diff --git a/tests/unit/fakes.py b/tests/unit/fakes.py
index b9a3715e..569d8113 100644
--- a/tests/unit/fakes.py
+++ b/tests/unit/fakes.py
@@ -1827,6 +1827,16 @@ class FakeUserContext(FakeContext):
 class FakeDeployment(dict):
     update_status = mock.Mock()
 
+    def __init__(self, **kwargs):
+        namespace = kwargs.pop("namespace", "openstack")
+        kwargs["credentials"] = {
+            namespace: [{"admin": kwargs.pop("admin", None),
+                         "users": kwargs.pop("users", [])}]}
+        dict.__init__(self, **kwargs)
+
+    def get_credentials_for(self, namespace):
+        return self["credentials"][namespace][0]
+
 
 class FakeTask(dict):
 
diff --git a/tests/unit/plugins/openstack/verification/tempest/test_config.py b/tests/unit/plugins/openstack/verification/tempest/test_config.py
index 0d220630..cdf64137 100644
--- a/tests/unit/plugins/openstack/verification/tempest/test_config.py
+++ b/tests/unit/plugins/openstack/verification/tempest/test_config.py
@@ -18,6 +18,7 @@ import mock
 from oslo_config import cfg
 
 from rally.plugins.openstack.verification.tempest import config
+from tests.unit import fakes
 from tests.unit import test
 
 
@@ -51,7 +52,8 @@ class TempestConfigfileManagerTestCase(test.TestCase):
 
         mock.patch("rally.osclients.Clients").start()
 
-        self.tempest = config.TempestConfigfileManager(CREDS)
+        deployment = fakes.FakeDeployment(**CREDS)
+        self.tempest = config.TempestConfigfileManager(deployment)
 
     def test__configure_auth(self):
         self.tempest.conf.add_section("auth")
diff --git a/tests/unit/plugins/openstack/verification/tempest/test_context.py b/tests/unit/plugins/openstack/verification/tempest/test_context.py
index abfd6a9f..1aad9ac2 100644
--- a/tests/unit/plugins/openstack/verification/tempest/test_context.py
+++ b/tests/unit/plugins/openstack/verification/tempest/test_context.py
@@ -59,7 +59,8 @@ class TempestContextTestCase(test.TestCase):
         self.mock_isfile = mock.patch("os.path.isfile",
                                       return_value=True).start()
 
-        cfg = {"verifier": mock.Mock(deployment=CREDS),
+        self.deployment = fakes.FakeDeployment(**CREDS)
+        cfg = {"verifier": mock.Mock(deployment=self.deployment),
                "verification": {"uuid": "uuid"}}
         cfg["verifier"].manager.home_dir = "/p/a/t/h"
         cfg["verifier"].manager.configfile = "/fake/path/to/config"
@@ -336,11 +337,13 @@ class TempestContextTestCase(test.TestCase):
     def test_setup(self, mock_clients, mock_create_dir,
                    mock__create_tempest_roles, mock__configure_option,
                    mock_open):
-        verifier = mock.MagicMock(deployment=CREDS)
+        self.deployment = fakes.FakeDeployment(**CREDS)
+        verifier = mock.Mock(deployment=self.deployment)
         verifier.manager.home_dir = "/p/a/t/h"
 
         # case #1: no neutron and heat
         mock_clients.return_value.services.return_value = {}
+
         ctx = context.TempestContext({"verifier": verifier})
         ctx.conf = mock.Mock()
         ctx.setup()
@@ -376,6 +379,7 @@ class TempestContextTestCase(test.TestCase):
         # case #2: neutron and heat are presented
         mock_clients.return_value.services.return_value = {
             "network": "neutron", "orchestration": "heat"}
+
         ctx = context.TempestContext({"verifier": verifier})
         ctx.conf = mock.Mock()
         ctx.setup()