diff --git a/tests/phpunit/tests/rest-api/rest-post-types-controller.php b/tests/phpunit/tests/rest-api/rest-post-types-controller.php
index 69f312a8eb3ed..ae8938c061d2c 100644
--- a/tests/phpunit/tests/rest-api/rest-post-types-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-post-types-controller.php
@@ -12,6 +12,7 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 	public function tear_down() {
 		unregister_post_type( 'cpt' );
 		unregister_post_type( 'cpt_template' );
+		unregister_post_type( 'cpt_template_null' );
 
 		parent::tear_down();
 	}