--- a/Lib/test/test_urllib2net.py
+++ b/Lib/test/test_urllib2net.py
@@ -222,6 +222,7 @@
         handlers = []
 
         cfh = urllib.request.CacheFTPHandler()
+        self.addCleanup(cfh.clear_cache)
         cfh.setTimeout(1)
         handlers.append(cfh)