diff --git a/lib/ramaze/helper/localize.rb b/lib/ramaze/helper/localize.rb
index f15438ee..142ee5f4 100644
--- a/lib/ramaze/helper/localize.rb
+++ b/lib/ramaze/helper/localize.rb
@@ -1,5 +1,6 @@
 require 'locale/tag'
 require 'locale'
+require 'yaml'
 
 module Ramaze
   module Helper