diff --git a/tests/PHPStan/Rules/Properties/ReadOnlyByPhpDocPropertyRuleTest.php b/tests/PHPStan/Rules/Properties/ReadOnlyByPhpDocPropertyRuleTest.php
index b13c566b4f..94f906d60c 100644
--- a/tests/PHPStan/Rules/Properties/ReadOnlyByPhpDocPropertyRuleTest.php
+++ b/tests/PHPStan/Rules/Properties/ReadOnlyByPhpDocPropertyRuleTest.php
@@ -4,6 +4,7 @@
 
 use PHPStan\Rules\Rule;
 use PHPStan\Testing\RuleTestCase;
+use const PHP_VERSION_ID;
 
 /**
  * @extends RuleTestCase<ReadOnlyByPhpDocPropertyRule>
@@ -18,6 +19,10 @@ protected function getRule(): Rule
 
 	public function testRule(): void
 	{
+		if (PHP_VERSION_ID < 80100) {
+			$this->markTestSkipped('Test requires PHP 8.1.');
+		}
+
 		$this->analyse([__DIR__ . '/data/read-only-property-phpdoc.php'], [
 			[
 				'@readonly property cannot have a default value.',
diff --git a/tests/PHPStan/Rules/Properties/data/read-only-property-phpdoc.php b/tests/PHPStan/Rules/Properties/data/read-only-property-phpdoc.php
index 6522f2668b..bb730d8e01 100644
--- a/tests/PHPStan/Rules/Properties/data/read-only-property-phpdoc.php
+++ b/tests/PHPStan/Rules/Properties/data/read-only-property-phpdoc.php
@@ -1,4 +1,4 @@
-<?php
+<?php // lint >= 8.1
 
 namespace ReadOnlyPropertyPhpDoc;
 
@@ -21,3 +21,13 @@ class Foo
 	private $baz = 0;
 
 }
+
+final class ErrorResponse
+{
+	public function __construct(
+		/** @readonly */
+		public string $message = ''
+	)
+	{
+	}
+}