diff -r bb77654dc7ae -r 6f9fcd29e290 hgext/win32mbcs.py
--- a/hgext/win32mbcs.py	Sat Dec 17 20:14:24 2016 +0530
+++ b/hgext/win32mbcs.py	Sat Dec 17 20:24:46 2016 +0530
@@ -53,6 +53,7 @@
 from mercurial import (
     encoding,
     error,
+    pycompat,
 )
 
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
@@ -97,7 +98,7 @@
     except UnicodeError:
         us = s
     if us and us[-1] not in ':/\\':
-        s += os.sep
+        s += pycompat.ossep
     return s