diff --git a/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/CountryConstraintValidator.php b/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/CountryConstraintValidator.php
index 87ed795..35c4e3e 100644
--- a/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/CountryConstraintValidator.php
+++ b/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/CountryConstraintValidator.php
@@ -15,8 +15,7 @@
 /**
  * Validates the country code.
  */
-class CountryConstraintValidator extends ConstraintValidator
-{
+class CountryConstraintValidator extends ConstraintValidator {
   /**
    * The country manager.
    *
@@ -45,7 +44,7 @@ public static function create(ContainerInterface $container) {
    * {@inheritdoc}
    */
   public function validate($value, Constraint $constraint) {
-    if ($value === null || $value === '') {
+    if ($value === NULL || $value === '') {
       return;
     }