diff --git a/rally-scenarios/rally.yaml b/rally-scenarios/rally.yaml
index 91ed7d5b09..01d46529e8 100644
--- a/rally-scenarios/rally.yaml
+++ b/rally-scenarios/rally.yaml
@@ -615,6 +615,24 @@
       sla:
         max_failure_percent: 0
 
+  GlanceImages.list_images:
+    -
+      runner:
+        type: "constant"
+        times: 5
+        concurrency: 5
+      context:
+        users:
+          tenants: 2
+          users_per_tenant: 2
+        images:
+          image_url: "http://download.cirros-cloud.net/0.3.1/cirros-0.3.1-x86_64-disk.img"
+          image_type: "qcow2"
+          image_container: "bare"
+          images_per_tenant: 2
+      sla:
+        max_failure_percent: 0
+
   NovaServers.boot_and_delete_server:
     -
       args:
diff --git a/rally/benchmark/context/images.py b/rally/benchmark/context/images.py
index 68d2dff903..d1527b1a3c 100644
--- a/rally/benchmark/context/images.py
+++ b/rally/benchmark/context/images.py
@@ -104,9 +104,8 @@ class ImageGenerator(base.Context):
     @classmethod
     def validate_semantic(cls, config, admin, users, task):
         """Check if the image service is available."""
-
         try:
-            glance = osclients.Clients(users[0]["endpoint"]).glance()
+            glance = users[0].glance()
             list(glance.images.list(limit=0))
         except Exception as e:
             message = _(
diff --git a/tests/benchmark/context/test_images.py b/tests/benchmark/context/test_images.py
index e08ac23570..0f137a52d6 100644
--- a/tests/benchmark/context/test_images.py
+++ b/tests/benchmark/context/test_images.py
@@ -141,26 +141,13 @@ class ImageGeneratorTestCase(test.TestCase):
         mock_image_remover.side_effect = Exception('failed_deletion')
         self.assertRaises(exceptions.ImageCleanUpException, images_ctx.cleanup)
 
-    @mock.patch("%s.images.osclients" % CTX)
-    def test_validate_semantic(self, mock_osclients):
-        user_key = [{'id': i, 'tenant_id': j, 'endpoint': 'endpoint'}
-                    for j in range(2)
-                    for i in range(5)]
+    def test_validate_semantic(self):
+        users = [fakes.FakeClients()]
+        images.ImageGenerator.validate_semantic(None, None, users, None)
 
-        fc = fakes.FakeClients()
-        mock_osclients.Clients.return_value = fc
-        images.ImageGenerator.validate_semantic(None, None,
-                                                user_key, None)
-
-    @mock.patch("%s.images.osclients" % CTX)
-    def test_validate_semantic_unavailabe(self, mock_osclients):
-        user_key = [{'id': i, 'tenant_id': j, 'endpoint': 'endpoint'}
-                    for j in range(2)
-                    for i in range(5)]
-
-        endpoint = mock.MagicMock()
-        (mock_osclients.Clients(endpoint).glance().images.list.
-            side_effect) = Exception('list_error')
+    @mock.patch("%s.images.osclients.Clients.glance" % CTX)
+    def test_validate_semantic_unavailabe(self, mock_glance):
+        mock_glance.side_effect = Exception("list error")
         self.assertRaises(exceptions.InvalidScenarioArgument,
                           images.ImageGenerator.validate_semantic, None, None,
-                          user_key, None)
+                          None, None)