--- a/hgext/transplant.py	Fri Apr 16 10:46:52 2021 +0200
+++ b/hgext/transplant.py	Fri Apr 16 10:46:56 2021 +0200
@@ -47,6 +47,7 @@
 from mercurial.utils import (
     procutil,
     stringutil,
+    urlutil,
 )
 
 
@@ -818,7 +819,8 @@
 
     sourcerepo = opts.get(b'source')
     if sourcerepo:
-        peer = hg.peer(repo, opts, ui.expandpath(sourcerepo))
+        u = urlutil.get_unique_pull_path(b'transplant', repo, ui, sourcerepo)[0]
+        peer = hg.peer(repo, opts, u)
         heads = pycompat.maplist(peer.lookup, opts.get(b'branch', ()))
         target = set(heads)
         for r in revs: