diff --git a/mercurial/bundle2.py b/mercurial/bundle2.py
--- a/mercurial/bundle2.py
+++ b/mercurial/bundle2.py
@@ -403,10 +403,9 @@ def processbundle(repo, unbundler, trans
     return op
 
 def _processchangegroup(op, cg, tr, source, url, **kwargs):
-    ret, addednodes = cg.apply(op.repo, tr, source, url, **kwargs)
+    ret = cg.apply(op.repo, tr, source, url, **kwargs)
     op.records.add('changegroup', {
         'return': ret,
-        'addednodes': addednodes,
     })
     return ret
 
diff --git a/mercurial/changegroup.py b/mercurial/changegroup.py
--- a/mercurial/changegroup.py
+++ b/mercurial/changegroup.py
@@ -412,7 +412,7 @@ class cg1unpacker(object):
             ret = deltaheads - 1
         else:
             ret = deltaheads + 1
-        return ret, added
+        return ret
 
 class cg2unpacker(cg1unpacker):
     """Unpacker for cg2 streams.