diff --git a/includes/category-mapper.php b/includes/category-mapper.php
index caf6a42..f4d9ae5 100644
--- a/includes/category-mapper.php
+++ b/includes/category-mapper.php
@@ -10,7 +10,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 	exit; // Exit if accessed directly.
 }
 
-use Activitypub\Activity\Event;
+use Activitypub\Activity\Extended_Object\Event;
 
 /**
  * ActivityPub Tribe Transformer