diff --git a/app/code/Magento/Cron/Setup/Recurring.php b/app/code/Magento/Cron/Setup/Recurring.php
index 38c9122783bd9..e45524c174afe 100644
--- a/app/code/Magento/Cron/Setup/Recurring.php
+++ b/app/code/Magento/Cron/Setup/Recurring.php
@@ -3,6 +3,7 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Cron\Setup;
 
diff --git a/app/code/Magento/Customer/Test/Unit/Controller/Section/LoadTest.php b/app/code/Magento/Customer/Test/Unit/Controller/Section/LoadTest.php
index 2552beeca463d..3e9089c473212 100644
--- a/app/code/Magento/Customer/Test/Unit/Controller/Section/LoadTest.php
+++ b/app/code/Magento/Customer/Test/Unit/Controller/Section/LoadTest.php
@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Customer\Test\Unit\Controller\Section;
 
 use Magento\Customer\Controller\Section\Load;
diff --git a/app/code/Magento/Sales/Test/Unit/Block/Order/TotalsTest.php b/app/code/Magento/Sales/Test/Unit/Block/Order/TotalsTest.php
index 7ad21f26a8bea..a8ce2ad4ff034 100644
--- a/app/code/Magento/Sales/Test/Unit/Block/Order/TotalsTest.php
+++ b/app/code/Magento/Sales/Test/Unit/Block/Order/TotalsTest.php
@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Sales\Test\Unit\Block\Order;
 
 use Magento\Framework\Registry;
diff --git a/app/code/Magento/Ui/Model/UrlInput/ConfigInterface.php b/app/code/Magento/Ui/Model/UrlInput/ConfigInterface.php
index cf48173b5b3de..b7254b5ff342c 100644
--- a/app/code/Magento/Ui/Model/UrlInput/ConfigInterface.php
+++ b/app/code/Magento/Ui/Model/UrlInput/ConfigInterface.php
@@ -3,6 +3,7 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Ui\Model\UrlInput;
 
diff --git a/app/code/Magento/Ups/Test/Unit/Model/CarrierCollectRatesOptionsTest.php b/app/code/Magento/Ups/Test/Unit/Model/CarrierCollectRatesOptionsTest.php
index e5bf27b154a8c..854f14f1b48bc 100644
--- a/app/code/Magento/Ups/Test/Unit/Model/CarrierCollectRatesOptionsTest.php
+++ b/app/code/Magento/Ups/Test/Unit/Model/CarrierCollectRatesOptionsTest.php
@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Ups\Test\Unit\Model;
 
 use PHPUnit_Framework_MockObject_MockObject as MockObject;
diff --git a/app/code/Magento/Webapi/Controller/Rest/RequestProcessorInterface.php b/app/code/Magento/Webapi/Controller/Rest/RequestProcessorInterface.php
index 43564bba00df8..f4340c18e2134 100644
--- a/app/code/Magento/Webapi/Controller/Rest/RequestProcessorInterface.php
+++ b/app/code/Magento/Webapi/Controller/Rest/RequestProcessorInterface.php
@@ -3,6 +3,7 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Webapi\Controller\Rest;
 
diff --git a/app/code/Magento/Webapi/Controller/Rest/RequestProcessorPool.php b/app/code/Magento/Webapi/Controller/Rest/RequestProcessorPool.php
index a4530021788c5..3fc7dd6f5c865 100644
--- a/app/code/Magento/Webapi/Controller/Rest/RequestProcessorPool.php
+++ b/app/code/Magento/Webapi/Controller/Rest/RequestProcessorPool.php
@@ -3,6 +3,7 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Webapi\Controller\Rest;
 
diff --git a/app/code/Magento/Webapi/Controller/Rest/SchemaRequestProcessor.php b/app/code/Magento/Webapi/Controller/Rest/SchemaRequestProcessor.php
index f1b6237d090f2..0f1587c342fa7 100644
--- a/app/code/Magento/Webapi/Controller/Rest/SchemaRequestProcessor.php
+++ b/app/code/Magento/Webapi/Controller/Rest/SchemaRequestProcessor.php
@@ -3,6 +3,7 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Webapi\Controller\Rest;
 
diff --git a/app/code/Magento/Webapi/Controller/Rest/SynchronousRequestProcessor.php b/app/code/Magento/Webapi/Controller/Rest/SynchronousRequestProcessor.php
index 2495f4bb1c168..e2dcbb5a40237 100644
--- a/app/code/Magento/Webapi/Controller/Rest/SynchronousRequestProcessor.php
+++ b/app/code/Magento/Webapi/Controller/Rest/SynchronousRequestProcessor.php
@@ -3,6 +3,7 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Webapi\Controller\Rest;