diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index c5b476e7248..dd04fce5aa3 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -382,12 +382,6 @@ Style/DateTime:
     - 'src/api/spec/features/webui/requests_spec.rb'
     - 'src/api/test/functional/maintenance_test.rb'
 
-# Offense count: 1
-# Cop supports --auto-correct.
-Style/Dir:
-  Exclude:
-    - 'src/api/script/start_test_backend'
-
 # Offense count: 631
 Style/Documentation:
   Enabled: false
diff --git a/src/api/script/start_test_backend b/src/api/script/start_test_backend
index 0675de05968..cb9f0c11f61 100755
--- a/src/api/script/start_test_backend
+++ b/src/api/script/start_test_backend
@@ -21,7 +21,7 @@ end
 backendtempdir = ENV['OBS_BACKEND_TEMP'] || "#{Rails.root}/tmp"
 backend_config = "#{backendtempdir}/config#{backend_dir_suffix}"
 backend_data   = "#{backendtempdir}/data#{backend_dir_suffix}"
-require File.expand_path(File.dirname(__FILE__)) + '/../test/test_helper'
+require __dir__ + '/../test/test_helper'
 
 Backend::Test.do_not_start_test_backend