diff --git a/config/boot.rb b/config/boot.rb
index fe6375db2..7ffec08ff 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -2,6 +2,11 @@
 #   licensed under the Affero General Public License version 3 or later.  See
 #   the COPYRIGHT file.
 
+if RUBY_VERSION.include?("1.9")
+  require 'yaml'
+  YAML::ENGINE.yamler= 'syck'
+end
+
 require 'rubygems'
 
 # Set up gems listed in the Gemfile.