diff --git a/classes/Activitypub_attachment.php b/classes/Activitypub_attachment.php
index 08d343d..374cc81 100644
--- a/classes/Activitypub_attachment.php
+++ b/classes/Activitypub_attachment.php
@@ -45,7 +45,7 @@ class Activitypub_attachment extends Managed_DataObject
         'id'        => $attachment->getID (),
         'mimetype'  => $attachment->mimetype,
         'url'       => $attachment->getUrl (),
-        'size'      => intval($attachment->size),
+        'size'      => intval($attachment->size), // $attachment->getSize ()
         'title'     => $attachment->getTitle (),
         'meta'      => null
       ];