diff --git a/lib/jekyll/migrators/wordpress.rb b/lib/jekyll/migrators/wordpress.rb
index b570ded9629..bd80daeeb6f 100644
--- a/lib/jekyll/migrators/wordpress.rb
+++ b/lib/jekyll/migrators/wordpress.rb
@@ -1,6 +1,7 @@
 require 'rubygems'
 require 'sequel'
 require 'fileutils'
+require 'yaml'
 
 # NOTE: This converter requires Sequel and the MySQL gems.
 # The MySQL gem can be difficult to install on OS X. Once you have MySQL