diff --git a/src/Filtering/ThreadHiding.coffee b/src/Filtering/ThreadHiding.coffee
index 80c11b1d2..d728504bd 100644
--- a/src/Filtering/ThreadHiding.coffee
+++ b/src/Filtering/ThreadHiding.coffee
@@ -21,7 +21,7 @@ ThreadHiding =
       if thread.stub
         $.prepend root, thread.stub
       else
-        threadRoot.nextElementSibling.hidden = true
+        root.nextElementSibling.hidden = true
     return
 
   syncCatalog: ->