diff --git a/src/Searchable.php b/src/Searchable.php
index 82ab12d..f3425cd 100644
--- a/src/Searchable.php
+++ b/src/Searchable.php
@@ -46,13 +46,15 @@ trait Searchable
      */
     public static function bootSearchable()
     {
-        static::saved(function (self $model) {
+        static::saved(function ($model) {
+            /** @var static $model */
             if ($model->shouldSyncDocument()) {
                 $model->document()->save();
             }
         });
 
-        static::deleted(function (self $model) {
+        static::deleted(function ($model) {
+            /** @var static $model */
             if ($model->shouldSyncDocument()) {
                 $model->document()->delete();
             }