diff --git a/tests/Common/Proxy/ProxyGeneratorTest.php b/tests/Common/Proxy/ProxyGeneratorTest.php
index 59b796eda..6187c9e0d 100644
--- a/tests/Common/Proxy/ProxyGeneratorTest.php
+++ b/tests/Common/Proxy/ProxyGeneratorTest.php
@@ -259,7 +259,7 @@ public function testClassWithNullableOptionalNonLastParameterOnProxiedMethods()
         }
 
         self::assertStringContainsString(
-            'public function midSignatureNullableParameter(\stdClass $param = NULL, $secondParam)',
+            'public function midSignatureNullableParameter(?\stdClass $param = NULL, $secondParam)',
             file_get_contents(__DIR__ . '/generated/__CG__DoctrineTestsCommonProxyNullableNonOptionalHintClass.php')
         );