--- a/mercurial/pycompat.py	Fri Jun 15 02:07:39 2018 +0530
+++ b/mercurial/pycompat.py	Wed Jun 13 22:51:08 2018 +0530
@@ -302,6 +302,7 @@
 else:
     import cStringIO
 
+    unicode = unicode
     bytechr = chr
     byterepr = repr
     bytestr = str