--- a/hghooks/mozhghooks/single_head_per_branch.py
+++ b/hghooks/mozhghooks/single_head_per_branch.py
@@ -25,16 +25,20 @@ def hook(ui, repo, source=None, **kwargs
 
         for node in heads:
             ctx = repo[node]
 
             # Filter closed branch heads.
             if ctx.closesbranch():
                 continue
 
+            # Hidden changesets shouldn't matter.
+            if ctx.hidden():
+                continue
+
             newheads.append(node)
 
         if len(newheads) > 1:
             print "\n\n************************** ERROR ****************************"
             print "Multiple heads detected on branch '%s'" % branch
             print "Only one head per branch is allowed!"
             print "*************************************************************\n\n"
             return 1

--- a/hghooks/tests/test-single_head_per_branch.t
+++ b/hghooks/tests/test-single_head_per_branch.t
@@ -144,22 +144,10 @@ Hidden changesets should not impact head
   $ hg commit -m 'commit after hidden'
   $ hg push
   pushing to $TESTTMP/mozilla-central
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
-  
-  
-  ************************** ERROR ****************************
-  Multiple heads detected on branch 'default'
-  Only one head per branch is allowed!
-  *************************************************************
-  
-  
-  transaction abort!
-  rollback completed
-  abort: pretxnchangegroup.b_singlehead hook failed
-  [255]
 
   $ cd ..