diff --git a/nova/tests/unit/compute/test_compute_mgr.py b/nova/tests/unit/compute/test_compute_mgr.py
index 311cca5adc..1ed96e5001 100644
--- a/nova/tests/unit/compute/test_compute_mgr.py
+++ b/nova/tests/unit/compute/test_compute_mgr.py
@@ -6266,6 +6266,8 @@ class ComputeManagerBuildInstanceTestCase(test.NoDBTestCase):
                 self.context, mock.sentinel.instance,
                 requested_networks=requested_networks)
 
+    @mock.patch('oslo_service.loopingcall._ThreadingEvent.wait',
+                new=mock.Mock())
     @mock.patch('nova.compute.manager.ComputeManager._deallocate_network')
     @mock.patch('nova.compute.manager.LOG.warning')
     def test_try_deallocate_network_retry_direct(self, warning_mock,