diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 9415dd39..9a733c37 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -182,7 +182,10 @@ def not_on_achievements?
   end
 
   def render_404
-    render template: 'errors/not_found', status: :not_found
+    respond_to do |format|
+      format.any(:html, :json, :xml) { render 'errors/not_found', status: :not_found }
+      format.all { render text: "Not Found", :content_type => Mime::TEXT, status: :not_found }
+    end
   end
 
   def render_500