diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 5ff55df..1e3f8ab 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,7 +1,8 @@
 # This file is copied to ~/spec when you run 'ruby script/generate rspec'
 # from the project root directory.
 ENV["RAILS_ENV"] = "test"
-require File.expand_path(File.dirname(__FILE__) + "/../../../../config/environment")
+redmine_root = ENV["REDMINE_ROOT"] || File.dirname(__FILE__) + "/../../../.."
+require File.expand_path(redmine_root + "/config/environment")
 require 'spec'
 require 'spec/rails'
 require 'ruby-debug'