diff --git a/tornado/test/simple_httpclient_test.py b/tornado/test/simple_httpclient_test.py
index 380463e3..237a30f8 100644
--- a/tornado/test/simple_httpclient_test.py
+++ b/tornado/test/simple_httpclient_test.py
@@ -210,7 +210,7 @@ class SimpleHTTPClientTestCase(AsyncHTTPTestCase, LogTrapTestCase):
     def test_request_timeout(self):
         response = self.fetch('/trigger?wake=false', request_timeout=0.1)
         self.assertEqual(response.code, 599)
-        self.assertTrue(0.099 < response.request_time < 0.11, response.request_time)
+        self.assertTrue(0.099 < response.request_time < 0.12, response.request_time)
         self.assertEqual(str(response.error), "HTTP 599: Timeout")
         # trigger the hanging request to let it clean up after itself
         self.triggers.popleft()()