diff --git a/doc/source/dev/dev-functional-test.rst b/doc/source/dev/dev-functional-test.rst
index 0ebf6846fd..c2008e7aec 100644
--- a/doc/source/dev/dev-functional-test.rst
+++ b/doc/source/dev/dev-functional-test.rst
@@ -40,7 +40,7 @@ Create the necessary keypair and flavor::
 
     source /opt/stack/devstack/openrc admin admin
     nova keypair-add --pub-key ~/.ssh/id_rsa.pub default
-    nova flavor-create  m1.magnum 100 2048 8 1
+    nova flavor-create  m1.magnum 100 1024 8 1
 
     source /opt/stack/devstack/openrc demo demo
     nova keypair-add --pub-key ~/.ssh/id_rsa.pub default
diff --git a/magnum/tests/contrib/post_test_hook.sh b/magnum/tests/contrib/post_test_hook.sh
index 75f8180336..b14d630155 100755
--- a/magnum/tests/contrib/post_test_hook.sh
+++ b/magnum/tests/contrib/post_test_hook.sh
@@ -94,7 +94,7 @@ nova keypair-add --pub-key ~/.ssh/id_rsa.pub default
 
 # Create magnum specific flavor for use in functional tests.
 echo_summary "Create a flavor"
-nova flavor-create  m1.magnum 100 2048 8 1
+nova flavor-create  m1.magnum 100 1024 8 1
 
 # Run functional tests
 # Currently we support functional-api, functional-k8s, will support swarm,
diff --git a/magnum/tests/functional/python_client_base.py b/magnum/tests/functional/python_client_base.py
index 2ea7e68c50..fbb690e1f8 100644
--- a/magnum/tests/functional/python_client_base.py
+++ b/magnum/tests/functional/python_client_base.py
@@ -117,6 +117,7 @@ class BaseMagnumClient(base.TestCase):
             external_network_id=cls.nic_id,
             image_id=cls.image_id,
             flavor_id=cls.flavor_id,
+            master_flavor_id=cls.flavor_id,
             docker_volume_size=docker_volume_size,
             network_driver=network_driver,
             coe=coe,