diff -r 1c5cbf28f007 -r d524c88511a7 mercurial/subrepo.py
--- a/mercurial/subrepo.py	Sun Dec 18 02:08:59 2016 +0530
+++ b/mercurial/subrepo.py	Mon Dec 19 00:16:52 2016 +0530
@@ -1313,7 +1313,7 @@
             notfoundhint = _("check git is installed and in your PATH")
             if e.errno != errno.ENOENT:
                 raise error.Abort(genericerror % (self._path, e.strerror))
-            elif os.name == 'nt':
+            elif pycompat.osname == 'nt':
                 try:
                     self._gitexecutable = 'git.cmd'
                     out, err = self._gitnodir(['--version'])