diff --git a/plugins/OStatus/lib/activity.php b/plugins/OStatus/lib/activity.php
index 5da6c75856..ea1303f199 100644
--- a/plugins/OStatus/lib/activity.php
+++ b/plugins/OStatus/lib/activity.php
@@ -258,6 +258,7 @@ class ActivityObject
     public $content;
     public $link;
     public $source;
+    public $avatar;
 
     /**
      * Constructor