diff --git a/cinder/backup/manager.py b/cinder/backup/manager.py
index 363a5784bb8..e8129779ca1 100644
--- a/cinder/backup/manager.py
+++ b/cinder/backup/manager.py
@@ -33,6 +33,7 @@ Volume backups can be created, restored, deleted and listed.
 
 import contextlib
 import os
+import typing
 
 from castellan import key_manager
 from eventlet import tpool
@@ -139,6 +140,7 @@ class BackupManager(manager.SchedulerDependentManager):
         self.service = importutils.import_class(self.driver_name)
         self.message_api = message_api.API()
 
+    @typing.no_type_check
     def init_host(self, **kwargs):
         """Run initialization needed for a standalone service."""
         ctxt = context.get_admin_context()
diff --git a/cinder/scheduler/host_manager.py b/cinder/scheduler/host_manager.py
index 041fbbe43eb..c4cc3edc706 100644
--- a/cinder/scheduler/host_manager.py
+++ b/cinder/scheduler/host_manager.py
@@ -445,6 +445,7 @@ class PoolState(BackendState):
             self.filter_function = capability.get('filter_function', None)
             self.goodness_function = capability.get('goodness_function', 0)
 
+    @typing.no_type_check
     def update_pools(self, capability):
         # Do nothing, since we don't have pools within pool, yet
         pass
diff --git a/cinder/volume/flows/manager/create_volume.py b/cinder/volume/flows/manager/create_volume.py
index 8e41162e43b..3749536cde5 100644
--- a/cinder/volume/flows/manager/create_volume.py
+++ b/cinder/volume/flows/manager/create_volume.py
@@ -1292,6 +1292,7 @@ class CreateVolumeOnFinishTask(NotifyVolumeActionTask):
             'migration_target_creating': 'migration_target',
         }
 
+    @typing.no_type_check
     def execute(self, context, volume, volume_spec):
         need_update_volume = volume_spec.pop('need_update_volume', True)
         if not need_update_volume: