diff -r a/Lib/subprocess.py b/Lib/subprocess.py
1079c1079
<                             if c2pwrite is not None and c2pwrite not in (p2cread, 1):
---
>                             if c2pwrite is not None and c2pwrite not in (p2cread, 1, 2):
1081c1081
<                             if errwrite is not None and errwrite not in (p2cread, c2pwrite, 2):
---
>                             if errwrite is not None and errwrite not in (p2cread, c2pwrite, 1, 2):