diff --git a/zmq/tests/test_poll.py b/zmq/tests/test_poll.py
index 15c3a6de5..b0a18c74f 100644
--- a/zmq/tests/test_poll.py
+++ b/zmq/tests/test_poll.py
@@ -166,11 +166,11 @@ def test_timeout(self):
         tic = time.perf_counter()
         poller.poll(0.005)
         toc = time.perf_counter()
-        toc - tic < 0.1
+        toc - tic < 0.5
         tic = time.perf_counter()
         poller.poll(50)
         toc = time.perf_counter()
-        assert toc - tic < 0.1
+        assert toc - tic < 0.5
         assert toc - tic > 0.01
         tic = time.perf_counter()
         poller.poll(500)