diff --git a/masakarimonitors/instancemonitor/instance.py b/masakarimonitors/instancemonitor/instance.py
index 5bab3e7..fecf372 100644
--- a/masakarimonitors/instancemonitor/instance.py
+++ b/masakarimonitors/instancemonitor/instance.py
@@ -48,7 +48,7 @@ class InstancemonitorManager(manager.Manager):
         self.event_loop_thread = threading.Thread(
             target=self._vir_event_loop_native_run,
             name="lib_virt_eventLoop")
-        self.event_loop_thread.setDaemon(True)
+        self.event_loop_thread.daemon = True
         self.event_loop_thread.start()
 
     def _my_domain_event_callback(self, conn, dom, event, detail, opaque):
diff --git a/masakarimonitors/introspectiveinstancemonitor/instance.py b/masakarimonitors/introspectiveinstancemonitor/instance.py
index 6152907..f799f03 100644
--- a/masakarimonitors/introspectiveinstancemonitor/instance.py
+++ b/masakarimonitors/introspectiveinstancemonitor/instance.py
@@ -107,7 +107,7 @@ class IntrospectiveInstanceMonitorManager(manager.Manager):
         self.event_loop_thread = threading.Thread(
             target=self._vir_event_loop_native_run,
             name="lib_virt_eventLoop")
-        self.event_loop_thread.setDaemon(True)
+        self.event_loop_thread.daemon = True
         self.event_loop_thread.start()
 
     def _my_domain_event_callback(self, conn, dom, event, detail, opaque):
diff --git a/masakarimonitors/tests/unit/instancemonitor/test_instance.py b/masakarimonitors/tests/unit/instancemonitor/test_instance.py
index 2d28d7d..a8abfee 100644
--- a/masakarimonitors/tests/unit/instancemonitor/test_instance.py
+++ b/masakarimonitors/tests/unit/instancemonitor/test_instance.py
@@ -240,7 +240,7 @@ class TestInstancemonitorManager(testtools.TestCase):
         handlers_count = 9
         self.assertTrue(exception_flag)
         mock_virEventRegisterDefaultImpl.assert_called_once()
-        mock_event_loop_thread.setDaemon.assert_called_once_with(True)
+        self.assertEqual(True, mock_event_loop_thread.daemon)
         mock_event_loop_thread.start.assert_called_once()
         mock_openAuth.assert_called_once_with(
             "qemu:///system",