diff --git a/lib/classes/JsonApi/Routes/Blubber/ThreadsUpdate.php b/lib/classes/JsonApi/Routes/Blubber/ThreadsUpdate.php
index 5c698a35c7e36cf19aa9bb6b0535073deda897a3..42688c8fd60e7c92b1f3a5f5e61e68b41ef8a207 100644
--- a/lib/classes/JsonApi/Routes/Blubber/ThreadsUpdate.php
+++ b/lib/classes/JsonApi/Routes/Blubber/ThreadsUpdate.php
@@ -53,7 +53,7 @@ class ThreadsUpdate extends JsonApiController
         return $this->getContentResponse($thread);
     }
 
-    protected function validateResourceDocument($json)
+    protected function validateResourceDocument($json, $data)
     {
         if (self::arrayHas($json, 'data.attributes.visited-at')) {
             $visitedAt = self::arrayGet($json, 'data.attributes.visited-at');