--- a/mercurial/commands.py	Thu Jun 22 15:59:07 2017 -0700
+++ b/mercurial/commands.py	Fri Jun 16 10:25:11 2017 -0700
@@ -5218,7 +5218,9 @@
             else:
                 txnname = 'unbundle\n%s' % util.hidepassword(url)
                 with repo.transaction(txnname) as tr:
-                    modheads, addednodes = gen.apply(repo, tr, 'unbundle', url)
+                    modheads = bundle2.applybundle1(repo, gen, tr,
+                                                    source='unbundle',
+                                                    url=url)
 
     return postincoming(ui, repo, modheads, opts.get(r'update'), None, None)