diff --git a/Gemfile b/Gemfile
index 0130a923..58a72818 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,6 +2,7 @@ source 'https://rubygems.org/'
 
 gemspec
 
+gem 'ostruct'
 gem 'rake'
 
 platforms :jruby do