diff --git a/judge/scripts/config/environment.rb b/judge/scripts/config/environment.rb
--- a/judge/scripts/config/environment.rb
+++ b/judge/scripts/config/environment.rb
@@ -1,6 +1,6 @@
 # Rails app directory
-RAILS_ROOT = File.join(File.dirname(__FILE__),"../../..")
-GRADER_ROOT = File.join(File.dirname(__FILE__),"..")
+RAILS_ROOT = File.expand_path(File.join(File.dirname(__FILE__),"../../.."))
+GRADER_ROOT = File.expand_path(File.join(File.dirname(__FILE__),".."))
 
 # This load all required codes
 require File.join(File.dirname(__FILE__),'../lib/boot')