diff --git a/neutron/tests/unit/agent/l3/test_agent.py b/neutron/tests/unit/agent/l3/test_agent.py
index d99b1c42daa..ba74a975ff4 100644
--- a/neutron/tests/unit/agent/l3/test_agent.py
+++ b/neutron/tests/unit/agent/l3/test_agent.py
@@ -40,8 +40,6 @@ from neutron.agent.linux import interface
 from neutron.agent.linux import ra
 from neutron.agent.metadata import driver as metadata_driver
 from neutron.agent import rpc as agent_rpc
-from neutron.callbacks import manager
-from neutron.callbacks import registry
 from neutron.common import config as base_config
 from neutron.common import constants as l3_constants
 from neutron.common import exceptions as n_exc
@@ -163,10 +161,6 @@ class BasicRouterOperationsFramework(base.BaseTestCase):
         self.ri_kwargs = {'agent_conf': self.conf,
                           'interface_driver': self.mock_driver}
 
-        self._callback_manager = manager.CallbacksManager()
-        mock.patch.object(registry, '_get_callback_manager',
-                          return_value=self._callback_manager).start()
-
     def _process_router_instance_for_agent(self, agent, ri, router):
         ri.router = router
         if not ri.radvd:
diff --git a/neutron/tests/unit/agent/l3/test_dvr_local_router.py b/neutron/tests/unit/agent/l3/test_dvr_local_router.py
index 1e81c8d4854..fe41f2fe87b 100644
--- a/neutron/tests/unit/agent/l3/test_dvr_local_router.py
+++ b/neutron/tests/unit/agent/l3/test_dvr_local_router.py
@@ -27,8 +27,6 @@ from neutron.agent.l3 import router_info
 from neutron.agent.linux import external_process
 from neutron.agent.linux import interface
 from neutron.agent.linux import ip_lib
-from neutron.callbacks import manager
-from neutron.callbacks import registry
 from neutron.common import config as base_config
 from neutron.common import constants as l3_constants
 from neutron.common import utils as common_utils
@@ -147,10 +145,6 @@ class TestDvrRouterOperations(base.BaseTestCase):
         self.ri_kwargs = {'agent_conf': self.conf,
                           'interface_driver': self.mock_driver}
 
-        self._callback_manager = manager.CallbacksManager()
-        mock.patch.object(registry, '_get_callback_manager',
-                          return_value=self._callback_manager).start()
-
     def _create_router(self, router=None, **kwargs):
         agent_conf = mock.Mock()
         self.router_id = _uuid()