diff --git a/tests/phpunit/tests/customize/manager.php b/tests/phpunit/tests/customize/manager.php
index a21a10358b..650d9d141b 100644
--- a/tests/phpunit/tests/customize/manager.php
+++ b/tests/phpunit/tests/customize/manager.php
@@ -19,13 +19,6 @@ class Tests_WP_Customize_Manager extends WP_UnitTestCase {
 	 */
 	public $manager;
 
-	/**
-	 * Symbol.
-	 *
-	 * @var stdClass
-	 */
-	public $undefined;
-
 	/**
 	 * Admin user ID.
 	 *