diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index ee61d421b080e4195e2c281b8f85af1fc481250c..c60e26983d1b4102591ba2fd3c1cd6e503648720 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -124,9 +124,8 @@ def length
         end
 
         def install(destinations = [ActionController::Base, ActionView::Base])
-          destinations.each do |dest|
-            dest.__send__(:include, @module)
-          end
+          helper = @module
+          destinations.each { |d| d.module_eval { include helper } }
         end
 
         private