diff -r e81d72b4b0ae -r c90a05124fae mercurial/scmposix.py
--- a/mercurial/scmposix.py	Tue Nov 01 08:22:50 2016 +0000
+++ b/mercurial/scmposix.py	Thu Nov 03 02:17:01 2016 +0530
@@ -4,6 +4,7 @@
 import sys
 
 from . import (
+    encoding,
     osutil,
 )
 
@@ -34,6 +35,6 @@
 
 def userrcpath():
     if sys.platform == 'plan9':
-        return [os.environ['home'] + '/lib/hgrc']
+        return [encoding.environ['home'] + '/lib/hgrc']
     else:
         return [os.path.expanduser('~/.hgrc')]