diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
index 592ea0a1786..69a568bda0a 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
@@ -91,6 +91,7 @@ abstract class ConfigEntityBase extends EntityBase implements ConfigEntityInterf
    *
    * @var array
    */
+  // phpcs:ignore Drupal.Classes.PropertyDeclaration
   protected $_core = [];
 
   /**
diff --git a/core/lib/Drupal/Core/DependencyInjection/DependencySerializationTrait.php b/core/lib/Drupal/Core/DependencyInjection/DependencySerializationTrait.php
index b151a3b837e..2fc17ccc6d1 100644
--- a/core/lib/Drupal/Core/DependencyInjection/DependencySerializationTrait.php
+++ b/core/lib/Drupal/Core/DependencyInjection/DependencySerializationTrait.php
@@ -15,6 +15,7 @@ trait DependencySerializationTrait {
    *
    * @var array
    */
+  // phpcs:ignore Drupal.Classes.PropertyDeclaration
   protected $_serviceIds = [];
 
   /**
@@ -22,6 +23,7 @@ trait DependencySerializationTrait {
    *
    * @var array
    */
+  // phpcs:ignore Drupal.Classes.PropertyDeclaration
   protected $_entityStorages = [];
 
   /**
diff --git a/core/modules/views/src/ResultRow.php b/core/modules/views/src/ResultRow.php
index da55038fc98..30814bf6281 100644
--- a/core/modules/views/src/ResultRow.php
+++ b/core/modules/views/src/ResultRow.php
@@ -12,6 +12,7 @@ class ResultRow {
    *
    * @var \Drupal\Core\Entity\EntityInterface
    */
+  // phpcs:ignore Drupal.Classes.PropertyDeclaration
   public $_entity = NULL;
 
   /**
@@ -19,6 +20,7 @@ class ResultRow {
    *
    * @var \Drupal\Core\Entity\EntityInterface[]
    */
+  // phpcs:ignore Drupal.Classes.PropertyDeclaration
   public $_relationship_entities = [];
 
   /**
diff --git a/core/phpcs.xml.dist b/core/phpcs.xml.dist
index 124c13fdbe6..6be9d6a7ba7 100644
--- a/core/phpcs.xml.dist
+++ b/core/phpcs.xml.dist
@@ -35,6 +35,7 @@
   <rule ref="Drupal.Classes.ClassFileName"/>
   <rule ref="Drupal.Classes.FullyQualifiedNamespace"/>
   <rule ref="Drupal.Classes.InterfaceName"/>
+  <rule ref="Drupal.Classes.PropertyDeclaration"/>
   <rule ref="Drupal.Classes.UnusedUseStatement"/>
   <rule ref="Drupal.Classes.UseGlobalClass"/>
   <rule ref="Drupal.Classes.UseLeadingBackslash"/>