mercurial/commands.py

--- a/mercurial/commands.py	Wed Jan 14 01:15:26 2015 +0100
+++ b/mercurial/commands.py	Sat Mar 11 11:02:25 2017 -0800
@@ -2383,7 +2383,7 @@
 
     # remove state when we complete successfully
     if not opts.get('dry_run'):
-        util.unlinkpath(repo.join('graftstate'), ignoremissing=True)
+        repo.vfs.unlinkpath('graftstate', ignoremissing=True)
 
     return 0