--- a/mercurial/changegroup.py	Tue Aug 09 15:55:44 2016 +0200
+++ b/mercurial/changegroup.py	Tue Aug 09 22:31:38 2016 +0200
@@ -942,7 +942,7 @@
     Another wrinkle is doing the reverse, figuring out which changeset in
     the changegroup a particular filenode or manifestnode belongs to.
     """
-    outgoing = discovery.outgoingbetween(repo, roots, heads)
+    outgoing = discovery.outgoing(repo, missingroots=roots, missingheads=heads)
     bundler = getbundler(version, repo)
     return getsubset(repo, outgoing, bundler, source)