diff --git a/config/environment.rb b/config/environment.rb
index 2d581168b1..7878eca47f 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -4,6 +4,9 @@
 # you don't control web/app server and can't set it the proper way
 # ENV['RAILS_ENV'] ||= 'production'
 
+# Specifies gem version of Rails to use when vendor/rails is not present
+RAILS_GEM_VERSION = '2.0.2' unless defined? RAILS_GEM_VERSION
+
 # Bootstrap the Rails environment, frameworks, and default configuration
 require File.join(File.dirname(__FILE__), 'boot')