diff --git a/actionpack/lib/action_view/helpers/prototype_helper.rb b/actionpack/lib/action_view/helpers/prototype_helper.rb
index <HASH>..<HASH> 100644
--- a/actionpack/lib/action_view/helpers/prototype_helper.rb
+++ b/actionpack/lib/action_view/helpers/prototype_helper.rb
@@ -1,4 +1,5 @@
 require 'set'
+require 'active_support/json'
 
 module ActionView
   module Helpers
diff --git a/actionpack/lib/action_view/helpers/scriptaculous_helper.rb b/actionpack/lib/action_view/helpers/scriptaculous_helper.rb
index <HASH>..<HASH> 100644
--- a/actionpack/lib/action_view/helpers/scriptaculous_helper.rb
+++ b/actionpack/lib/action_view/helpers/scriptaculous_helper.rb
@@ -1,4 +1,5 @@
 require 'action_view/helpers/javascript_helper'
+require 'active_support/json'
 
 module ActionView
   module Helpers
prototype and scripty helpers require json