diff --git a/lib/thredded/email_transformer.rb b/lib/thredded/email_transformer.rb
index <HASH>..<HASH> 100644
--- a/lib/thredded/email_transformer.rb
+++ b/lib/thredded/email_transformer.rb
@@ -17,8 +17,8 @@ module Thredded
     end
     @transformers = [Onebox, Spoiler]
 
-    # @param doc [Nokogiri::HTML::Document]
-    def self.call(doc)
+    # @param dom [Nokogiri::HTML::Document]
+    def self.call(doc, *)
       transformers.each { |transformer| transformer.call(doc) }
     end
   end
fix an issue with the latest roadie

a change to roadie **seems to** enforce an extra param to the
before_transformation callback. This was always documented
so not a breaking change. It is causing test failures