diff --git a/includes/class-dispatcher.php b/includes/class-dispatcher.php
index bf77e1651..c7a1cc5e4 100644
--- a/includes/class-dispatcher.php
+++ b/includes/class-dispatcher.php
@@ -55,7 +55,7 @@ public static function process_outbox( $id ) {
 				break;
 			case 'user':
 			default:
-				$actor_id = $activity->post_author;
+				$actor_id = $outbox_item->post_author;
 				break;
 		}