diff --git a/tests/Stripe/WebhookTest.php b/tests/Stripe/WebhookTest.php
index 588ec034b..eeebd0324 100644
--- a/tests/Stripe/WebhookTest.php
+++ b/tests/Stripe/WebhookTest.php
@@ -38,7 +38,7 @@ public function testValidJsonAndHeader()
         $sigHeader = $this->generateHeader();
         $event = Webhook::constructEvent(self::EVENT_PAYLOAD, $sigHeader, self::SECRET);
         static::assertSame('evt_test_webhook', $event->id);
-        static::assertInstanceOf(\Stripe\Terminal\Reader::class, $event->data->object);
+        static::assertInstanceOf(\Stripe\Terminal\Reader::class, $event->data->__get('object'));
     }
 
     public function testInvalidJson()