diff --git a/src/wp-includes/php-compat/readonly.php b/src/wp-includes/php-compat/readonly.php
index 1c7fd9deff..16f0fab2c0 100644
--- a/src/wp-includes/php-compat/readonly.php
+++ b/src/wp-includes/php-compat/readonly.php
@@ -4,7 +4,7 @@
  * to `wp_readonly()` in WordPress 5.9.0.
  *
  * In order to avoid PHP parser errors, this function was extracted
- * to this separate file and is only included conditionally on PHP 8.1.
+ * to this separate file and is only included conditionally on PHP < 8.1.
  *
  * Including this file on PHP >= 8.1 results in a fatal error.
  *
diff --git a/tests/phpunit/tests/general/template_CheckedSelectedHelper.php b/tests/phpunit/tests/general/template_CheckedSelectedHelper.php
index 2c3afa9a80..c6d3a5b9de 100644
--- a/tests/phpunit/tests/general/template_CheckedSelectedHelper.php
+++ b/tests/phpunit/tests/general/template_CheckedSelectedHelper.php
@@ -56,12 +56,9 @@ class Tests_General_Template_CheckedSelectedHelper extends WP_UnitTestCase {
 	 *
 	 * @ticket 53858
 	 * @covers ::readonly
+	 * @requires PHP < 8.1
 	 */
 	public function test_readonly_with_equal_values() {
-		if ( ! function_exists( 'readonly' ) ) {
-			$this->markTestSkipped( 'readonly() function is not available on PHP 8.1' );
-		}
-
 		$this->setExpectedDeprecated( 'readonly' );
 
 		// Call the function via a variable to prevent a parse error for this file on PHP 8.1.