--- a/mercurial/windows.py	Fri Dec 29 22:15:37 2017 -0500
+++ b/mercurial/windows.py	Fri Dec 29 22:54:14 2017 -0500
@@ -32,6 +32,7 @@
 osutil = policy.importmod(r'osutil')
 
 executablepath = win32.executablepath
+getfsmountpoint = win32.getvolumename
 getfstype = win32.getfstype
 getuser = win32.getuser
 hidewindow = win32.hidewindow