diff --git a/classes/Notice.php b/classes/Notice.php
index 9a4b6db7ff..462ce8b53c 100644
--- a/classes/Notice.php
+++ b/classes/Notice.php
@@ -1504,9 +1504,8 @@ class Notice extends Managed_DataObject
 
         if (Event::handle('StartNoticeAsActivity', array($this, &$act))) {
 
-            $act->id      = $this->uri;
+            $act->id      = TagURI::mint("post:".$this->id);
             $act->time    = strtotime($this->created);
-            $act->link    = $this->bestUrl();
             $act->content = common_xml_safe_str($this->rendered);
 
             $profile = $this->getProfile();