--- a/hgext/shelve.py	Mon Feb 04 20:46:33 2019 -0800
+++ b/hgext/shelve.py	Mon Feb 04 20:49:45 2019 -0800
@@ -679,7 +679,8 @@
         # revert will overwrite unknown files, so move them out of the way
         for file in repo.status(unknown=True).unknown:
             if file in files:
-                util.rename(file, scmutil.origpath(ui, repo, file))
+                util.rename(repo.wjoin(file),
+                            scmutil.backuppath(ui, repo, file))
         ui.pushbuffer(True)
         cmdutil.revert(ui, repo, shelvectx, repo.dirstate.parents(),
                        *pathtofiles(repo, files),