diff --git a/test/functional/webhooks_controller_test.rb b/test/functional/webhooks_controller_test.rb
index 783a25b3e..6507782a6 100644
--- a/test/functional/webhooks_controller_test.rb
+++ b/test/functional/webhooks_controller_test.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'test_helper'
+require_relative '../test_helper'
 
 class WebhooksControllerTest < Redmine::ControllerTest
   setup do
diff --git a/test/unit/lib/webhook_endpoint_validator_test.rb b/test/unit/lib/webhook_endpoint_validator_test.rb
index 426316567..d08914a80 100644
--- a/test/unit/lib/webhook_endpoint_validator_test.rb
+++ b/test/unit/lib/webhook_endpoint_validator_test.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'test_helper'
+require_relative '../../test_helper'
 
 class WebhookEndpointValidatorTest < ActiveSupport::TestCase
   class TestModel
diff --git a/test/unit/webhook_payload_test.rb b/test/unit/webhook_payload_test.rb
index e1e809871..5c1ebd928 100644
--- a/test/unit/webhook_payload_test.rb
+++ b/test/unit/webhook_payload_test.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'test_helper'
+require_relative '../test_helper'
 
 class WebhookPayloadTest < ActiveSupport::TestCase
   include ActiveJob::TestHelper
diff --git a/test/unit/webhook_test.rb b/test/unit/webhook_test.rb
index 442d5220c..abb39692a 100644
--- a/test/unit/webhook_test.rb
+++ b/test/unit/webhook_test.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'test_helper'
+require_relative '../test_helper'
 require 'pp'
 
 class WebhookTest < ActiveSupport::TestCase