diff --git a/mercurial/branchmap.py b/mercurial/branchmap.py
--- a/mercurial/branchmap.py
+++ b/mercurial/branchmap.py
@@ -411,6 +411,7 @@
         if ntiprev > self.tiprev:
             self.tiprev = ntiprev
             self.tipnode = cl.node(ntiprev)
+            self.filteredhash = scmutil.filteredhash(repo, self.tiprev)
 
         if not self.validfor(repo):
             # cache key are not valid anymore