diff --git a/neutron/tests/functional/base.py b/neutron/tests/functional/base.py
index e3218d44467..f1ca8812685 100644
--- a/neutron/tests/functional/base.py
+++ b/neutron/tests/functional/base.py
@@ -41,6 +41,7 @@ from neutron.conf.plugins.ml2.drivers.ovn import ovn_conf
 # the SqlFixture
 from neutron.db import models  # noqa
 from neutron import manager
+from neutron.plugins.ml2.drivers.ovn.agent import neutron_agent
 from neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb import worker
 from neutron.plugins.ml2.drivers import type_geneve  # noqa
 from neutron import service  # noqa
@@ -200,6 +201,10 @@ class TestOVNFunctionalBase(test_plugin.Ml2PluginV2TestCase,
         self.maintenance_worker = maintenance_worker
         self._start_idls()
         self._start_ovn_northd()
+        self.addCleanup(self._reset_agent_cache_singleton)
+
+    def _reset_agent_cache_singleton(self):
+        neutron_agent.AgentCache._instance = None
 
     def _get_install_share_path(self):
         lookup_paths = set()