diff --git a/tests/Fixtures/ProductModel.php b/tests/Fixtures/ProductModel.php
index fdf4f43..1939d69 100644
--- a/tests/Fixtures/ProductModel.php
+++ b/tests/Fixtures/ProductModel.php
@@ -6,7 +6,7 @@ class ProductModel
 {
     public $someValue = 'Some value';
 
-    public function find($id)
+    public function find($id) : self
     {
         return $this;
     }