diff --git a/lib/Alchemy/Phrasea/Media/SubdefSubstituer.php b/lib/Alchemy/Phrasea/Media/SubdefSubstituer.php
index 3bbdc2666d..2259fa572d 100644
--- a/lib/Alchemy/Phrasea/Media/SubdefSubstituer.php
+++ b/lib/Alchemy/Phrasea/Media/SubdefSubstituer.php
@@ -73,6 +73,9 @@ class SubdefSubstituer
 
         $this->createMediaSubdef($record, 'document', $media);
 
+        $record->setMimeType($media->getFile()->getMimeType());
+        $record->setType($media->getType());
+
         $record->write_metas();
 
         if ($shouldSubdefsBeRebuilt) {