diff --git a/util/ipresolver/test/test_ipresolver.py b/util/ipresolver/test/test_ipresolver.py
index ebd475b52..19e8283a0 100644
--- a/util/ipresolver/test/test_ipresolver.py
+++ b/util/ipresolver/test/test_ipresolver.py
@@ -64,4 +64,5 @@ def test_thread_missing_file():
     with patch('time.sleep', side_effect=LoopInterruptionForTest) as sleep:
       update_ip_thread = _UpdateIPRange(_UPDATE_INTERVAL)
       update_ip_thread.start()
+      update_ip_thread.join(30)
       sleep.assert_called_with(_FAILED_UPDATE_RETRY_SECS)