diff -r 5631b0116374 -r c93dd9d9f1e6 mercurial/bundle2.py
--- a/mercurial/bundle2.py	Wed Jul 15 11:38:54 2020 +0200
+++ b/mercurial/bundle2.py	Fri Jul 17 09:20:48 2020 +0200
@@ -1711,7 +1711,7 @@
                 b'nbchanges', b'%d' % cg.extras[b'clcount'], mandatory=False
             )
         if opts.get(b'phases') and repo.revs(
-            b'%ln and secret()', outgoing.missingheads
+            b'%ln and secret()', outgoing.ancestorsof
         ):
             part.addparam(
                 b'targetphase', b'%d' % phases.secret, mandatory=False
@@ -1753,7 +1753,7 @@
     # consume little memory (1M heads is 40MB) b) we don't want to send the
     # part if we don't have entries and knowing if we have entries requires
     # cache lookups.
-    for node in outgoing.missingheads:
+    for node in outgoing.ancestorsof:
         # Don't compute missing, as this may slow down serving.
         fnode = cache.getfnode(node, computemissing=False)
         if fnode is not None: