diff --git a/tests/phpunit/tests/canonical.php b/tests/phpunit/tests/canonical.php
index 06379361887c2..ebe5a8f1b4f77 100644
--- a/tests/phpunit/tests/canonical.php
+++ b/tests/phpunit/tests/canonical.php
@@ -47,6 +47,7 @@ public function set_up() {
 	 */
 	public function tear_down() {
 		unregister_post_type( 'wp_tests_private' );
+		_unregister_post_status( 'custom' );
 
 		parent::tear_down();
 	}