diff --git a/tests/HttpClientTest.php b/tests/HttpClientTest.php
index 4673ebd..7d144cc 100644
--- a/tests/HttpClientTest.php
+++ b/tests/HttpClientTest.php
@@ -89,7 +89,7 @@ public function test_that_we_can_chain_additional_methods_beside_default_options
 
         $this->factory->withOptions([
             'headers' => [
-                'X-Another-Custom-Header' => 'another-custom-value'
+                'X-Another-Custom-Header' => 'another-custom-value',
             ],
         ])->withBasicAuth('username', 'password')->get('https://foo.com');