diff --git a/neutron/db/l3_dvr_db.py b/neutron/db/l3_dvr_db.py
index f5df0244a82..6f0364ede8b 100644
--- a/neutron/db/l3_dvr_db.py
+++ b/neutron/db/l3_dvr_db.py
@@ -16,6 +16,7 @@ import collections
 from neutron_lib.api.definitions import l3 as l3_apidef
 from neutron_lib.api.definitions import portbindings
 from neutron_lib.api.definitions import portbindings_extended
+from neutron_lib.api.definitions import router_admin_state_down_before_update
 from neutron_lib.api import validators
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import exceptions
@@ -45,7 +46,6 @@ from neutron.db import l3_attrs_db
 from neutron.db import l3_db
 from neutron.db.models import allowed_address_pair as aap_models
 from neutron.db import models_v2
-from neutron.extensions import _admin_state_down_before_update_lib
 from neutron.ipam import utils as ipam_utils
 from neutron.objects import agent as ag_obj
 from neutron.objects import l3agent as rb_obj
@@ -61,7 +61,7 @@ def is_admin_state_down_necessary():
     global _IS_ADMIN_STATE_DOWN_NECESSARY
     if _IS_ADMIN_STATE_DOWN_NECESSARY is None:
         _IS_ADMIN_STATE_DOWN_NECESSARY = \
-            _admin_state_down_before_update_lib.ALIAS in (extensions.
+            router_admin_state_down_before_update.ALIAS in (extensions.
                     PluginAwareExtensionManager.get_instance().extensions)
     return _IS_ADMIN_STATE_DOWN_NECESSARY
 
diff --git a/neutron/extensions/_admin_state_down_before_update_lib.py b/neutron/extensions/_admin_state_down_before_update_lib.py
deleted file mode 100644
index 65e22c091f5..00000000000
--- a/neutron/extensions/_admin_state_down_before_update_lib.py
+++ /dev/null
@@ -1,32 +0,0 @@
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-"""
-TODO(mattw4): This module should be deleted once neutron-lib containing
-https://review.openstack.org/#/c/634509/ change is released.
-"""
-from neutron_lib.api.definitions import l3 as l3_apidef
-
-ALIAS = 'router-admin-state-down-before-update'
-IS_SHIM_EXTENSION = True
-IS_STANDARD_ATTR_EXTENSION = False
-NAME = "Enforce Router's Admin State Down Before Update Extension"
-DESCRIPTION = ('Ensure that the admin state of a router is down '
-               '(admin_state_up=False) before updating the distributed '
-               'attribute')
-UPDATED_TIMESTAMP = '2019-04-08 13:30:00'
-RESOURCE_ATTRIBUTE_MAP = {}
-SUB_RESOURCE_ATTRIBUTE_MAP = {}
-ACTION_MAP = {}
-REQUIRED_EXTENSIONS = [l3_apidef.ALIAS]
-OPTIONAL_EXTENSIONS = []
-ACTION_STATUS = {}
diff --git a/neutron/extensions/admin_state_down_before_update.py b/neutron/extensions/admin_state_down_before_update.py
index 900dbdc2de1..252d0d7aa95 100644
--- a/neutron/extensions/admin_state_down_before_update.py
+++ b/neutron/extensions/admin_state_down_before_update.py
@@ -10,7 +10,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from neutron.extensions import _admin_state_down_before_update_lib as apidef
+from neutron_lib.api.definitions import \
+    router_admin_state_down_before_update as apidef
 from neutron_lib.api import extensions
 
 
diff --git a/neutron/services/l3_router/l3_router_plugin.py b/neutron/services/l3_router/l3_router_plugin.py
index 2e8a7627648..463c43b4f4b 100644
--- a/neutron/services/l3_router/l3_router_plugin.py
+++ b/neutron/services/l3_router/l3_router_plugin.py
@@ -25,6 +25,8 @@ from neutron_lib.api.definitions import l3_ext_ha_mode
 from neutron_lib.api.definitions import l3_flavors
 from neutron_lib.api.definitions import l3_port_ip_change_not_allowed
 from neutron_lib.api.definitions import qos_gateway_ip
+from neutron_lib.api.definitions import \
+    router_admin_state_down_before_update as r_admin_state_down_before_update
 from neutron_lib.api.definitions import router_availability_zone
 from neutron_lib import constants as n_const
 from neutron_lib.db import resource_extend
@@ -49,7 +51,6 @@ from neutron.db import l3_gateway_ip_qos
 from neutron.db import l3_hamode_db
 from neutron.db import l3_hascheduler_db
 from neutron.db.models import l3 as l3_models
-from neutron.extensions import _admin_state_down_before_update_lib
 from neutron.quota import resource_registry
 from neutron import service
 from neutron.services.l3_router.service_providers import driver_controller
@@ -63,6 +64,8 @@ def disable_dvr_extension_by_config(aliases):
         LOG.info('Disabled DVR extension.')
         if 'dvr' in aliases:
             aliases.remove('dvr')
+        if r_admin_state_down_before_update.ALIAS in aliases:
+            aliases.remove(r_admin_state_down_before_update.ALIAS)
 
 
 def disable_l3_qos_extension_by_plugins(ext, aliases):
@@ -104,7 +107,7 @@ class L3RouterPlugin(service_base.ServicePluginBase,
                                     floatingip_pools.ALIAS,
                                     qos_gateway_ip.ALIAS,
                                     l3_port_ip_change_not_allowed.ALIAS,
-                                    _admin_state_down_before_update_lib.ALIAS]
+                                    r_admin_state_down_before_update.ALIAS]
 
     __native_pagination_support = True
     __native_sorting_support = True