diff --git a/tests/ClassTest.php b/tests/ClassTest.php
index 8c4d9ccbf..d245fb44f 100644
--- a/tests/ClassTest.php
+++ b/tests/ClassTest.php
@@ -464,7 +464,9 @@ class ClassTest extends TestCase
             ],
             'classAliasNoException' => [
                 'code' => '<?php
-                    class_alias("Bar\F1", "Bar\F2");
+                    namespace {
+                        class_alias("Bar\F1", "Bar\F2");
+                    }
 
                     namespace Bar {
                         class F1 {