diff --git a/tempest/scenario/test_server_basic_ops.py b/tempest/scenario/test_server_basic_ops.py
index b795775..d9918f3 100644
--- a/tempest/scenario/test_server_basic_ops.py
+++ b/tempest/scenario/test_server_basic_ops.py
@@ -48,7 +48,7 @@
             self.image_ref = CONF.compute.image_ref
         if not hasattr(self, 'flavor_ref'):
             self.flavor_ref = CONF.compute.flavor_ref
-        self.image_utils = test_utils.ImageUtils()
+        self.image_utils = test_utils.ImageUtils(self.manager)
         if not self.image_utils.is_flavor_enough(self.flavor_ref,
                                                  self.image_ref):
             raise self.skipException(
diff --git a/tempest/scenario/utils.py b/tempest/scenario/utils.py
index e5613d6..b4f2466 100644
--- a/tempest/scenario/utils.py
+++ b/tempest/scenario/utils.py
@@ -30,28 +30,16 @@
 CONF = config.CONF
 
 
-@misc.singleton
 class ImageUtils(object):
 
     default_ssh_user = 'root'
 
-    def __init__(self):
+    def __init__(self, os):
         # Load configuration items
         self.ssh_users = json.loads(CONF.input_scenario.ssh_user_regex)
         self.non_ssh_image_pattern = \
             CONF.input_scenario.non_ssh_image_regex
         # Setup clients
-        network_resources = {
-            'network': False,
-            'router': False,
-            'subnet': False,
-            'dhcp': False,
-        }
-        self.isolated_creds = credentials.get_isolated_credentials(
-            name='ScenarioImageUtils',
-            identity_version=CONF.identity.auth_version,
-            network_resources=network_resources)
-        os = clients.Manager(self.isolated_creds.get_primary_creds())
         self.images_client = os.images_client
         self.flavors_client = os.flavors_client
 
@@ -131,6 +119,9 @@
         nname = ''.join(c for c in nname if c in self.validchars)
         return nname
 
+    def clear_creds(self):
+        self.isolated_creds.clear_isolated_creds()
+
     @property
     def scenario_images(self):
         """
@@ -177,12 +168,19 @@
         loader, standard_tests, pattern = args
     else:
         standard_tests, module, loader = args
+    output = None
+    scenario_utils = None
     try:
         scenario_utils = InputScenarioUtils()
         scenario_flavor = scenario_utils.scenario_flavors
         scenario_image = scenario_utils.scenario_images
     except (exceptions.InvalidConfiguration, TypeError):
-        return standard_tests
+        output = standard_tests
+    finally:
+        if scenario_utils:
+            scenario_utils.clear_creds()
+    if output is not None:
+        return output
     for test in testtools.iterate_tests(standard_tests):
         setattr(test, 'scenarios', testscenarios.multiply_scenarios(
             scenario_image,