diff --git a/neutron/tests/functional/agent/linux/test_process_monitor.py b/neutron/tests/functional/agent/linux/test_process_monitor.py
index 0802c3a4589..ba64d46c934 100644
--- a/neutron/tests/functional/agent/linux/test_process_monitor.py
+++ b/neutron/tests/functional/agent/linux/test_process_monitor.py
@@ -96,6 +96,7 @@ class BaseTestProcessMonitor(base.BaseTestCase):
             exception=RuntimeError('Not all children respawned.'))
 
     def cleanup_spawned_children(self):
+        self._process_monitor.stop()
         for pm in self._child_processes:
             pm.disable()