diff --git a/src/applications/transactions/engine/PhabricatorTimelineEngine.php b/src/applications/transactions/engine/PhabricatorTimelineEngine.php
index 2fa0b1451d..8f32d81ff9 100644
--- a/src/applications/transactions/engine/PhabricatorTimelineEngine.php
+++ b/src/applications/transactions/engine/PhabricatorTimelineEngine.php
@@ -6,6 +6,7 @@ abstract class PhabricatorTimelineEngine
   private $viewer;
   private $object;
   private $xactions;
+  private $request;
   private $viewData;
 
   final public static function newForObject($object) {