diff --git a/nova/api/openstack/compute/assisted_volume_snapshots.py b/nova/api/openstack/compute/assisted_volume_snapshots.py
index 97052e346b..b2f60933a4 100644
--- a/nova/api/openstack/compute/assisted_volume_snapshots.py
+++ b/nova/api/openstack/compute/assisted_volume_snapshots.py
@@ -29,9 +29,6 @@ from nova import exception
 from nova.policies import assisted_volume_snapshots as avs_policies
 
 
-ALIAS = 'os-assisted-volume-snapshots'
-
-
 class AssistedVolumeSnapshotsController(wsgi.Controller):
     """The Assisted volume snapshots API controller for the OpenStack API."""
 
@@ -96,22 +93,3 @@ class AssistedVolumeSnapshotsController(wsgi.Controller):
             # microversion, which we should just do in a single microversion
             # across all APIs when we fix status code wrinkles.
             raise exc.HTTPBadRequest(explanation=e.format_message())
-
-
-class AssistedVolumeSnapshots(extensions.V21APIExtensionBase):
-    """Assisted volume snapshots."""
-
-    name = "AssistedVolumeSnapshots"
-    alias = ALIAS
-    version = 1
-
-    def get_resources(self):
-        res = [extensions.ResourceExtension(ALIAS,
-                                    AssistedVolumeSnapshotsController())]
-        return res
-
-    def get_controller_extensions(self):
-        """It's an abstract function V21APIExtensionBase and the extension
-        will not be loaded without it.
-        """
-        return []
diff --git a/nova/api/openstack/compute/extension_info.py b/nova/api/openstack/compute/extension_info.py
index cd072c8e2a..952e970a6e 100644
--- a/nova/api/openstack/compute/extension_info.py
+++ b/nova/api/openstack/compute/extension_info.py
@@ -177,6 +177,10 @@ hardcoded_extensions = [
      'alias': 'os-aggregates',
      'description': 'Admin-only aggregate administration.'
     },
+    {'name': 'AssistedVolumeSnapshots',
+     'alias': 'os-assisted-volume-snapshots',
+     'description': 'Assisted volume snapshots.'
+    },
     {'name': 'DiskConfig',
      'alias': 'os-disk-config',
      'description': 'Disk Management Extension.'},
diff --git a/nova/api/openstack/compute/routes.py b/nova/api/openstack/compute/routes.py
index 31d564033a..fa6ec61a1c 100644
--- a/nova/api/openstack/compute/routes.py
+++ b/nova/api/openstack/compute/routes.py
@@ -21,6 +21,7 @@ from nova.api.openstack.compute import admin_actions
 from nova.api.openstack.compute import admin_password
 from nova.api.openstack.compute import agents
 from nova.api.openstack.compute import aggregates
+from nova.api.openstack.compute import assisted_volume_snapshots
 from nova.api.openstack.compute import config_drive
 from nova.api.openstack.compute import console_output
 from nova.api.openstack.compute import create_backup
@@ -85,6 +86,11 @@ aggregates_controller = functools.partial(
     _create_controller, aggregates.AggregateController, [], [])
 
 
+assisted_volume_snapshots_controller = functools.partial(
+    _create_controller,
+    assisted_volume_snapshots.AssistedVolumeSnapshotsController, [], [])
+
+
 keypairs_controller = functools.partial(
     _create_controller, keypairs.KeypairController, [], [])
 
@@ -231,6 +237,12 @@ ROUTE_LIST = (
     ('/os-aggregates/{id}/action', {
         'POST': [aggregates_controller, 'action'],
     }),
+    ('/os-assisted-volume-snapshots', {
+        'POST': [assisted_volume_snapshots_controller, 'create']
+    }),
+    ('/os-assisted-volume-snapshots/{id}', {
+        'DELETE': [assisted_volume_snapshots_controller, 'delete']
+    }),
     ('/os-floating-ip-dns', {
         'GET': [floating_ip_dns_controller, 'index']
     }),
diff --git a/setup.cfg b/setup.cfg
index 0d1ef692ca..8075ad689f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -72,7 +72,6 @@ wsgi_scripts =
     nova-metadata-wsgi = nova.api.metadata.wsgi:init_application
 
 nova.api.v21.extensions =
-    assisted_volume_snapshots = nova.api.openstack.compute.assisted_volume_snapshots:AssistedVolumeSnapshots
     attach_interfaces = nova.api.openstack.compute.attach_interfaces:AttachInterfaces
     availability_zone = nova.api.openstack.compute.availability_zone:AvailabilityZone
     baremetal_nodes = nova.api.openstack.compute.baremetal_nodes:BareMetalNodes