diff --git a/samples/openapi3/client/petstore/php/SwaggerClient-php/tests/RequestTest.php b/samples/openapi3/client/petstore/php/SwaggerClient-php/tests/RequestTest.php
index 779ae71ab027..cb1d9d62fb7e 100644
--- a/samples/openapi3/client/petstore/php/SwaggerClient-php/tests/RequestTest.php
+++ b/samples/openapi3/client/petstore/php/SwaggerClient-php/tests/RequestTest.php
@@ -4,6 +4,8 @@ namespace Swagger\Client;
 
 use Swagger\Client\Api\FakeApi;
 
+require_once __DIR__ . '/FakeHttpClient.php';
+
 class RequestTest extends \PHPUnit_Framework_TestCase
 {