diff --git a/activerecord/lib/active_record.rb b/activerecord/lib/active_record.rb
index 3e080ae810..2ed18b3313 100755
--- a/activerecord/lib/active_record.rb
+++ b/activerecord/lib/active_record.rb
@@ -46,6 +46,7 @@ ActiveRecord::Base.class_eval do
 end
 
 require 'active_record/mixins/list'
+require 'active_record/mixins/touch'
 
 require 'active_record/connection_adapters/mysql_adapter'
 require 'active_record/connection_adapters/postgresql_adapter'