diff --git a/lib/php/test/Unit/Lib/Transport/TCurlClientTest.php b/lib/php/test/Unit/Lib/Transport/TCurlClientTest.php
index 74c64aa0dbb..82bc20e4d2c 100644
--- a/lib/php/test/Unit/Lib/Transport/TCurlClientTest.php
+++ b/lib/php/test/Unit/Lib/Transport/TCurlClientTest.php
@@ -28,6 +28,9 @@
 use Thrift\Exception\TTransportException;
 use Thrift\Transport\TCurlClient;
 
+/**
+ * @preserveGlobalState disabled
+ */
 class TCurlClientTest extends TestCase
 {
     use PHPMock;