diff --git a/trio/tests/test_dtls.py b/trio/tests/test_dtls.py
index e771d8acbe..1420ea43d1 100644
--- a/trio/tests/test_dtls.py
+++ b/trio/tests/test_dtls.py
@@ -3,7 +3,6 @@
 import trio.testing
 from trio import DTLSEndpoint
 import random
-import sys
 import attr
 from contextlib import asynccontextmanager
 from itertools import count
@@ -102,11 +101,12 @@ async def test_smoke(ipv6):
 
 @slow
 async def test_handshake_over_terrible_network(autojump_clock):
-    # PyPy is not fast enough
-    HANDSHAKES = 500 if sys.implementation.name == "pypy" else 1000
+    HANDSHAKES = 100
     r = random.Random(0)
     fn = FakeNet()
     fn.enable()
+    # avoid spurious timeouts on slow machines
+    autojump_clock.autojump_threshold = 0.001
 
     async with dtls_echo_server() as (_, address):
         async with trio.open_nursery() as nursery: