diff --git a/tests/Fixtures/BuyableProduct.php b/tests/Fixtures/BuyableProduct.php
index 7ef6e5d..34b6fb8 100644
--- a/tests/Fixtures/BuyableProduct.php
+++ b/tests/Fixtures/BuyableProduct.php
@@ -3,8 +3,9 @@
 namespace Gloudemans\Tests\Shoppingcart\Fixtures;
 
 use Gloudemans\Shoppingcart\Contracts\Buyable;
+use Illuminate\Database\Eloquent\Model;
 
-class BuyableProduct implements Buyable
+class BuyableProduct extends Model implements Buyable
 {
     /**
      * @var int|string