diff --git a/Lib/test/test_mailbox.py b/Lib/test/test_mailbox.py
index 382a42e..1d1a063 100644
--- a/Lib/test/test_mailbox.py
+++ b/Lib/test/test_mailbox.py
@@ -2,6 +2,12 @@
 import os
 import test_support
 
+# cleanup
+try:
+    os.unlink(test_support.TESTFN)
+except os.error:
+    pass
+
 # create a new maildir mailbox to work with:
 curdir = os.path.join(test_support.TESTFN, "cur")
 newdir = os.path.join(test_support.TESTFN, "new")