diff --git a/core/modules/user/src/AccountForm.php b/core/modules/user/src/AccountForm.php
index 3624a9c..94f8ecd 100644
--- a/core/modules/user/src/AccountForm.php
+++ b/core/modules/user/src/AccountForm.php
@@ -11,6 +11,7 @@
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\Messenger\MessengerInterface;
 use Drupal\language\ConfigurableLanguageManagerInterface;
 use Drupal\user\Plugin\LanguageNegotiation\LanguageNegotiationUser;
 use Drupal\user\Plugin\LanguageNegotiation\LanguageNegotiationUserAdmin;
@@ -29,6 +30,13 @@
   protected $languageManager;
 
   /**
+   * Provides messenger service.
+   *
+   * @var \Drupal\Core\Messenger\MessengerInterface
+   */
+  protected $messenger;
+
+  /**
    * Constructs a new EntityForm object.
    *
    * @param \Drupal\Core\Entity\EntityRepositoryInterface $entity_repository
@@ -39,10 +47,13 @@
    *   The entity type bundle service.
    * @param \Drupal\Component\Datetime\TimeInterface $time
    *   The time service.
+   * @param \Drupal\Core\Messenger\MessengerInterface $messenger
+   *   The messenger service.
    */
-  public function __construct(EntityRepositoryInterface $entity_repository, LanguageManagerInterface $language_manager, EntityTypeBundleInfoInterface $entity_type_bundle_info = NULL, TimeInterface $time = NULL) {
+  public function __construct(EntityRepositoryInterface $entity_repository, LanguageManagerInterface $language_manager, EntityTypeBundleInfoInterface $entity_type_bundle_info = NULL, TimeInterface $time = NULL, MessengerInterface $messenger) {
     parent::__construct($entity_repository, $entity_type_bundle_info, $time);
     $this->languageManager = $language_manager;
+    $this->messenger = $messenger;
   }
 
   /**
@@ -53,7 +64,8 @@ public static function create(ContainerInterface $container) {
       $container->get('entity.repository'),
       $container->get('language_manager'),
       $container->get('entity_type.bundle.info'),
-      $container->get('datetime.time')
+      $container->get('datetime.time'),
+      $container->get('messenger')
     );
   }
 
@@ -71,6 +83,10 @@ public function form(array $form, FormStateInterface $form_state) {
     $register = $account->isAnonymous();
     $admin = $user->hasPermission('administer users');
 
+    if ($account->id() == 1) {
+      $this->messenger->addWarning($this->t('Be careful, you are editing the admin user. Changes made here could lock you out of your site completely.'), 'warning');
+    }
+
     // Account information.
     $form['account'] = [
       '#type'   => 'container',