diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -4148,7 +4148,7 @@
     other = hg.peer(repo, opts, dest)
 
     if revs:
-        revs = [repo.lookup(r) for r in scmutil.revrange(repo, revs)]
+        revs = [repo[r].node() for r in scmutil.revrange(repo, revs)]
         if not revs:
             raise error.Abort(_("specified revisions evaluate to an empty set"),
                              hint=_("use different revision arguments"))