diff --git a/lib/shoulda.rb b/lib/shoulda.rb
index bf10182..ddad22b 100644
--- a/lib/shoulda.rb
+++ b/lib/shoulda.rb
@@ -3,6 +3,7 @@
 require 'shoulda/assertions'
 require 'shoulda/macros'
 require 'shoulda/helpers'
+require 'shoulda/rails' if defined? RAILS_ROOT
 
 module Test # :nodoc: all
   module Unit