diff --git a/Lib/test/test_mhlib.py b/Lib/test/test_mhlib.py
index b258e990189..3c675ae501e 100644
--- a/Lib/test/test_mhlib.py
+++ b/Lib/test/test_mhlib.py
@@ -13,7 +13,7 @@ import sys
 import mhlib
 
 if (sys.platform.startswith("win") or sys.platform=="riscos" or
-      sys.platform.startswith("atheos"):
+      sys.platform.startswith("atheos")):
     # mhlib.updateline() renames a file to the name of a file that already
     # exists.  That causes a reasonable OS <wink> to complain in test_sequence
     # here, like the "OSError: [Errno 17] File exists" raised on Windows.