diff --git a/lib/Alchemy/Phrasea/Border/MimeGuesserConfiguration.php b/lib/Alchemy/Phrasea/Border/MimeGuesserConfiguration.php
index ebf39721d5..e870d91c7b 100644
--- a/lib/Alchemy/Phrasea/Border/MimeGuesserConfiguration.php
+++ b/lib/Alchemy/Phrasea/Border/MimeGuesserConfiguration.php
@@ -40,8 +40,6 @@ class MimeGuesserConfiguration
         $guesser->register(new AudioMimeTypeGuesser());
         $guesser->register(new VideoMimeTypeGuesser());
 
-        $guesser->register(new AlchemyMimeTypeGuesser());
-
         if ($this->conf->isSetup()) {
             $conf = $this->conf->getConfig();
 
diff --git a/lib/Alchemy/Phrasea/Media/MimeTypeGuesser.php b/lib/Alchemy/Phrasea/Media/MimeTypeGuesser.php
deleted file mode 100644
index 1ab737d814..0000000000
--- a/lib/Alchemy/Phrasea/Media/MimeTypeGuesser.php
+++ /dev/null
@@ -1,35 +0,0 @@
-<?php
-
-namespace Alchemy\Phrasea\Media;
-
-use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface;
-
-class MimeTypeGuesser implements MimeTypeGuesserInterface
-{
-    public static $mimeTypes = array(
-        'mpeg' => 'video/mpeg',
-        'mpg'  => 'video/mpeg',
-        'mov'  => 'video/quicktime',
-        'dv'   => 'video/x-dv',
-        'xls'  => 'application/vnd.ms-excel',
-        'doc'  => 'application/msword',
-        'ppt'  => 'application/vnd.ms-powerpoint',
-        'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
-        'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
-        'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
-    );
-
-    /**
-     * {@inheritdoc}
-     */
-    public function guess($path)
-    {
-        $extension = strtolower(pathinfo($path, PATHINFO_EXTENSION));
-
-        if (array_key_exists($extension, static::$mimeTypes)) {
-            return static::$mimeTypes[$extension];
-        }
-
-        return null;
-    }
-}