diff --git a/magnum/tests/functional/k8s/test_k8s_python_client.py b/magnum/tests/functional/k8s/test_k8s_python_client.py
index 7172a0dd1c..15ac6d969b 100644
--- a/magnum/tests/functional/k8s/test_k8s_python_client.py
+++ b/magnum/tests/functional/k8s/test_k8s_python_client.py
@@ -17,5 +17,6 @@ class TestKubernetesAPIs(base.BaseK8sTest):
     cluster_template_kwargs = {
         "tls_disabled": False,
         "network_driver": 'flannel',
-        "volume_driver": 'cinder'
+        "volume_driver": 'cinder',
+        "docker_storage_driver": 'overlay',
     }
diff --git a/magnum/tests/functional/k8s_ironic/test_k8s_python_client.py b/magnum/tests/functional/k8s_ironic/test_k8s_python_client.py
index e10e35f36b..e6047be82c 100644
--- a/magnum/tests/functional/k8s_ironic/test_k8s_python_client.py
+++ b/magnum/tests/functional/k8s_ironic/test_k8s_python_client.py
@@ -21,4 +21,5 @@ class TestFedoraKubernetesIronicAPIs(base.BaseK8sTest):
         "volume_driver": None,
         "fixed_subnet": 'private-subnet',
         "server_type": 'bm',
+        "docker_storage_driver": 'overlay',
     }