mercurial/dirstate.py

--- a/mercurial/dirstate.py	Sat Dec 17 19:56:30 2016 +0530
+++ b/mercurial/dirstate.py	Sat Dec 17 20:02:50 2016 +0530
@@ -286,7 +286,7 @@
         # self._root ends with a path separator if self._root is '/' or 'C:\'
         rootsep = self._root
         if not util.endswithsep(rootsep):
-            rootsep += os.sep
+            rootsep += pycompat.ossep
         if cwd.startswith(rootsep):
             return cwd[len(rootsep):]
         else: