--- a/hgext/shelve.py	Wed Jan 14 01:15:26 2015 +0100
+++ b/hgext/shelve.py	Sat Mar 11 11:02:25 2017 -0800
@@ -218,7 +218,7 @@
 
     @classmethod
     def clear(cls, repo):
-        util.unlinkpath(repo.join(cls._filename), ignoremissing=True)
+        repo.vfs.unlinkpath(cls._filename, ignoremissing=True)
 
 def cleanupoldbackups(repo):
     vfs = vfsmod.vfs(repo.join(backupdir))