diff --git a/Gemfile b/Gemfile
index 7a8c5604b0..fe6ef9aa8a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,6 +5,7 @@ gem "rails", :path => File.dirname(__FILE__)
 
 gem "rake",  ">= 0.8.7"
 gem "mocha", ">= 0.9.8"
+gem "rdoc",  "2.2"
 
 mri = !defined?(RUBY_ENGINE) || RUBY_ENGINE == "ruby"
 if mri && RUBY_VERSION < '1.9'
@@ -44,10 +45,6 @@ elsif RUBY_ENGINE == "jruby"
   end
 end
 
-group :documentation do
-  gem 'rdoc', '2.2'
-end
-
 if ENV['CI']
   gem "nokogiri", ">= 1.4.0"