diff --git a/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php b/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php
index 8e5c95a2c0..e1a041ba8e 100644
--- a/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php
+++ b/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php
@@ -22,6 +22,7 @@ class ExtensionMimeTypeGuesser implements MimeTypeGuesserInterface {
       1 => 'application/atom',
       2 => 'application/atomcat+xml',
       3 => 'application/atomserv+xml',
+      359 => 'application/braille'
       4 => 'application/cap',
       5 => 'application/cu-seeme',
       6 => 'application/dsptype',
@@ -856,6 +857,7 @@ class ExtensionMimeTypeGuesser implements MimeTypeGuesserInterface {
       'weba' => 356,
       'webm' => 357,
       'vtt' => 358,
+      'brf' => 359,
     ),
   );