diff --git a/tests/test_threaded_backend.py b/tests/test_threaded_backend.py
index 5da3dda..3ff30a8 100644
--- a/tests/test_threaded_backend.py
+++ b/tests/test_threaded_backend.py
@@ -35,7 +35,7 @@ def setUp(self):
 
     def stop_worker(self):
         self.backend.worker_limit = 0
-        time.sleep(self.qtimeout)
+        time.sleep(self.qtimeout * 2)
         self.assertEqual(self.backend.thread, None)
 
     def test_backend_args(self):