diff --git a/tests/Twilio/ClusterTest.php b/tests/Twilio/ClusterTest.php
index c355ee2162..923446011d 100644
--- a/tests/Twilio/ClusterTest.php
+++ b/tests/Twilio/ClusterTest.php
@@ -70,7 +70,7 @@ public function testSpecialCharacters(): void
     public function testListParams(): void
     {
         $sinkConfiguration = ["destination" => "http://example.org/webhook", "method" => "post", "batch_events" => false];
-        $types = [["type" => "com.twilio.messaging.message.delivered"], ["type" => "com.twilio.messaging.message.sent"]];
+        $types = ["{\"type\": \"com.twilio.messaging.message.delivered\"}", "{\"type\": \"com.twilio.messaging.message.sent\"}"];
 
         $sink = self::$twilio->events->v1->sinks->create("test sink php", $sinkConfiguration, "webhook");
         $this->assertNotNull($sink);
@@ -82,4 +82,4 @@ public function testListParams(): void
         $this->assertTrue(self::$twilio->events->v1->subscriptions($subscription->sid)->delete());
         $this->assertTrue(self::$twilio->events->v1->sinks($sink->sid)->delete());
     }
-}
\ No newline at end of file
+}