diff --git a/defaults/main.yml b/defaults/main.yml
index 16c99220..e0924a9e 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -72,7 +72,6 @@ magnum_galera_database_name: magnum_service
 magnum_galera_user: magnum
 
 # Rabbit vars
-magnum_rpc_backend: rabbit
 magnum_rabbitmq_userid: magnum
 magnum_rabbitmq_vhost: /magnum
 magnum_rabbitmq_servers: 127.0.0.1
diff --git a/releasenotes/notes/remove_rpc_backend-9813a3455f234521.yaml b/releasenotes/notes/remove_rpc_backend-9813a3455f234521.yaml
new file mode 100644
index 00000000..d7d498e2
--- /dev/null
+++ b/releasenotes/notes/remove_rpc_backend-9813a3455f234521.yaml
@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    Remove ``magnum_rpc_backend`` option due to deprecation of
+    rpc_backend option in oslo.messaging.
diff --git a/templates/magnum.conf.j2 b/templates/magnum.conf.j2
index 150cae9a..ff0225f3 100644
--- a/templates/magnum.conf.j2
+++ b/templates/magnum.conf.j2
@@ -3,7 +3,7 @@
 use_stderr = False
 debug = {{ debug }}
 host = {{ ansible_host }}
-rpc_backend = {{ magnum_rpc_backend }}
+transport_url = rabbit://{% for host in magnum_rabbitmq_servers.split(',') %}{{ magnum_rabbitmq_userid }}:{{ magnum_rabbitmq_password }}@{{ host }}:{{ magnum_rabbitmq_port }}{% if not loop.last %},{% else %}/{{ magnum_rabbitmq_vhost }}{% endif %}{% endfor %}
 
 [api]
 host = {{ ansible_host }}
@@ -54,12 +54,7 @@ endpoint_type = internalURL
 endpoint_type = internalURL
 
 [oslo_messaging_rabbit]
-rabbit_port = {{ magnum_rabbitmq_port }}
-rabbit_hosts = {{ magnum_rabbitmq_servers }}
 ssl = {{ magnum_rabbitmq_use_ssl }}
-rabbit_userid = {{ magnum_rabbitmq_userid }}
-rabbit_password = {{ magnum_rabbitmq_password }}
-rabbit_virtual_host = {{ magnum_rabbitmq_vhost }}
 rabbit_notification_exchange = magnum
 rabbit_notification_topic = notification