diff --git a/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php b/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php
index 3fc80f9..b0c716a 100644
--- a/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php
+++ b/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php
@@ -865,6 +865,13 @@ class ExtensionMimeTypeGuesser implements MimeTypeGuesserInterface {
   );
 
   /**
+   * The MIME types mapping array after going through the module handler.
+   *
+   * @var array
+   */
+  protected $mapping;
+
+  /**
    * The module handler.
    *
    * @var \Drupal\Core\Extension\ModuleHandlerInterface
@@ -885,7 +892,7 @@ public function __construct(ModuleHandlerInterface $module_handler, array $mappi
   }
 
   /**
-   * @{inheritdoc}
+   * {@inheritdoc}
    */
   public function guess($path) {
     if (empty($this->mapping)) {
diff --git a/core/lib/Drupal/Core/File/MimeType/StreamWrapperMimeTypeGuesser.php b/core/lib/Drupal/Core/File/MimeType/StreamWrapperMimeTypeGuesser.php
index d9bdba4..7171c95 100644
--- a/core/lib/Drupal/Core/File/MimeType/StreamWrapperMimeTypeGuesser.php
+++ b/core/lib/Drupal/Core/File/MimeType/StreamWrapperMimeTypeGuesser.php
@@ -15,20 +15,19 @@
 class StreamWrapperMimeTypeGuesser extends MimeTypeGuesser {
 
   /**
-   * @{inheritdoc}
+   * {@inheritdoc}
    */
   protected static $instance = NULL;
 
-
   /**
-   * @{inheritdoc}
+   * {@inheritdoc}
    */
   protected function __construct() {
     // Do not register any guesser automatically.
   }
 
   /**
-   * @{inheritdoc}
+   * {@inheritdoc}
    */
   public static function getInstance() {
     if (static::$instance === NULL) {
@@ -39,7 +38,7 @@ public static function getInstance() {
   }
 
   /**
-   * @{inheritdoc}
+   * {@inheritdoc}
    */
   public function guess($path) {
     if ($wrapper = file_stream_wrapper_get_instance_by_uri($path)) {