diff --git a/Herbert/Framework/Enqueue.php b/Herbert/Framework/Enqueue.php
index 160a960..c0cf67a 100644
--- a/Herbert/Framework/Enqueue.php
+++ b/Herbert/Framework/Enqueue.php
@@ -327,7 +327,7 @@ public function filterSearch($attrs, $filterWith)
      */
     public function filterPostType($attrs, $filterWith)
     {
-        return array_search(get_post_type(), $filterWith) !== null;
+        return array_search(get_post_type(), $filterWith) !== FALSE;
     }
 
 }