diff --git a/actionpack/lib/action_dispatch/http/mime_negotiation.rb b/actionpack/lib/action_dispatch/http/mime_negotiation.rb

index f17b93fad7..a39052e6f7 100644

--- a/actionpack/lib/action_dispatch/http/mime_negotiation.rb

+++ b/actionpack/lib/action_dispatch/http/mime_negotiation.rb

@@ -76,6 +76,11 @@ def formats

           else

             [Mime[:html]]

           end

+

+          v = v.select do |format|

+            format.symbol || format.ref == "*/*"

+          end

+

           set_header k, v

         end

       end