diff --git a/test/unit/lib/redmine/scm/adapters/git_adapter_test.rb b/test/unit/lib/redmine/scm/adapters/git_adapter_test.rb
index 2c7fd89..caab4b6 100644
--- a/test/unit/lib/redmine/scm/adapters/git_adapter_test.rb
+++ b/test/unit/lib/redmine/scm/adapters/git_adapter_test.rb
@@ -8,7 +8,7 @@ begin
   require 'mocha'
 
   class GitAdapterTest < ActiveSupport::TestCase
-    REPOSITORY_PATH = RAILS_ROOT.gsub(%r{config\/\.\.}, '') + '/tmp/test/git_repository'
+    REPOSITORY_PATH = Rails.root.join('tmp/test/git_repository').to_s
 
     FELIX_UTF8 = "Felix Schäfer"
     FELIX_HEX  = "Felix Sch\xC3\xA4fer"