diff --git a/app/contracts/settings/working_days_params_contract.rb b/app/contracts/settings/working_days_params_contract.rb
index cd0faf86d21e..42bacb779bab 100644
--- a/app/contracts/settings/working_days_params_contract.rb
+++ b/app/contracts/settings/working_days_params_contract.rb
@@ -42,9 +42,7 @@ def working_days_are_present
     end
 
     def unique_job
-      if GoodJob::Job
-           .where(finished_at: nil)
-           .exists?(job_class: WorkPackages::ApplyWorkingDaysChangeJob.name)
+      WorkPackages::ApplyWorkingDaysChangeJob.new.check_concurrency do
         errors.add :base, :previous_working_day_changes_unprocessed
       end
     end
diff --git a/app/workers/job_concurrency.rb b/app/workers/job_concurrency.rb
new file mode 100644
index 000000000000..c98816841ade
--- /dev/null
+++ b/app/workers/job_concurrency.rb
@@ -0,0 +1,42 @@
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) 2012-2024 the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module JobConcurrency
+  extend ActiveSupport::Concern
+
+  included do
+    include GoodJob::ActiveJobExtensions::Concurrency
+  end
+
+  ##
+  # Run the concurrency check of good_job without actually trying to enqueue it
+  # Will call the provided block in case the job would be cancelled
+  def check_concurrency(&block)
+    good_job_enqueue_concurrency_check(self, on_abort: block, on_enqueue: nil)
+  end
+end
diff --git a/app/workers/work_packages/apply_working_days_change_job.rb b/app/workers/work_packages/apply_working_days_change_job.rb
index 619acf4e9073..feff945dc083 100644
--- a/app/workers/work_packages/apply_working_days_change_job.rb
+++ b/app/workers/work_packages/apply_working_days_change_job.rb
@@ -27,8 +27,13 @@
 #++
 
 class WorkPackages::ApplyWorkingDaysChangeJob < ApplicationJob
+  include JobConcurrency
   queue_with_priority :above_normal
 
+  good_job_control_concurrency_with(
+    total_limit: 1
+  )
+
   def perform(user_id:, previous_working_days:, previous_non_working_days:)
     user = User.find(user_id)
 
diff --git a/spec/contracts/settings/working_days_params_contract_spec.rb b/spec/contracts/settings/working_days_params_contract_spec.rb
index f67f074e0a21..31f2e46ec8bd 100644
--- a/spec/contracts/settings/working_days_params_contract_spec.rb
+++ b/spec/contracts/settings/working_days_params_contract_spec.rb
@@ -31,8 +31,8 @@
 
 RSpec.describe Settings::WorkingDaysParamsContract do
   include_context 'ModelContract shared context'
+  shared_let(:current_user) { create(:admin) }
   let(:setting) { Setting }
-  let(:current_user) { build_stubbed(:admin) }
   let(:params) { { working_days: [1] } }
   let(:contract) do
     described_class.new(setting, current_user, params:)
@@ -46,11 +46,16 @@
     include_examples 'contract is invalid', base: :working_days_are_missing
   end
 
-  context 'with an ApplyWorkingDaysChangeJob already existing' do
+  context 'with an ApplyWorkingDaysChangeJob already existing',
+          with_good_job: WorkPackages::ApplyWorkingDaysChangeJob do
     let(:params) { { working_days: [1, 2, 3] } }
+
     before do
-      ActiveJob::Base.disable_test_adapter
-      WorkPackages::ApplyWorkingDaysChangeJob.perform_later
+      WorkPackages::ApplyWorkingDaysChangeJob
+        .set(wait: 10.minutes) # GoodJob executes inline job without wait immediately
+        .perform_later(user_id: current_user.id,
+                       previous_non_working_days: [],
+                       previous_working_days: [1, 2, 3, 4])
     end
 
     include_examples 'contract is invalid', base: :previous_working_day_changes_unprocessed
diff --git a/spec/support/shared/with_good_job.rb b/spec/support/shared/with_good_job.rb
new file mode 100644
index 000000000000..1cdf84367ae7
--- /dev/null
+++ b/spec/support/shared/with_good_job.rb
@@ -0,0 +1,53 @@
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) 2012-2024 the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+# Disable the test adapter for the given classes
+# allowing GoodJob to handle execution and scheduling,
+# which in turn allows us to check concurrency controls etc.
+RSpec.configure do |config|
+  config.around(:example, :with_good_job) do |example|
+    original_adapter = ActiveJob::Base.queue_adapter
+    good_job_adapter = GoodJob::Adapter.new(execution_mode: :inline)
+
+    begin
+      classes = Array(example.metadata[:with_good_job])
+      unless classes.all? { |cls| cls <= ApplicationJob }
+        raise ArgumentError.new("Pass the ApplicationJob subclasses you want to disable the test adapter on.")
+      end
+
+      classes.each(&:disable_test_adapter)
+      ActiveJob::Base.queue_adapter = good_job_adapter
+      example.run
+
+    ensure
+      ActiveJob::Base.queue_adapter = original_adapter
+      classes.each { |cls| cls.enable_test_adapter(original_adapter) }
+      good_job_adapter&.shutdown
+    end
+  end
+end