diff --git a/mercurial/bundlerepo.py b/mercurial/bundlerepo.py
--- a/mercurial/bundlerepo.py
+++ b/mercurial/bundlerepo.py
@@ -164,7 +164,7 @@ class bundlerevlog(revlog.revlog):
 
     def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
         raise NotImplementedError
-    def addgroup(self, revs, linkmapper, transaction):
+    def addgroup(self, deltas, transaction, addrevisioncb=None):
         raise NotImplementedError
     def strip(self, rev, minlink):
         raise NotImplementedError
diff --git a/mercurial/unionrepo.py b/mercurial/unionrepo.py
--- a/mercurial/unionrepo.py
+++ b/mercurial/unionrepo.py
@@ -126,7 +126,7 @@ class unionrevlog(revlog.revlog):
 
     def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
         raise NotImplementedError
-    def addgroup(self, revs, linkmapper, transaction):
+    def addgroup(self, deltas, transaction, addrevisioncb=None):
         raise NotImplementedError
     def strip(self, rev, minlink):
         raise NotImplementedError