diff -r 39d13b8c101d -r b02e210a6817 mercurial/windows.py
--- a/mercurial/windows.py	Thu Oct 20 23:53:36 2016 +0900
+++ b/mercurial/windows.py	Fri Oct 21 00:03:46 2016 +0900
@@ -171,8 +171,6 @@
             self.close()
             raise IOError(errno.EPIPE, 'Broken pipe')
 
-sys.stdout = winstdout(sys.stdout)
-
 def _is_win_9x():
     '''return true if run on windows 95, 98 or me.'''
     try: