diff --git a/tests/Fixtures/Php81TestClass.php b/tests/Fixtures/Php81TestClass.php
index 455ec0e8f..a052ec443 100644
--- a/tests/Fixtures/Php81TestClass.php
+++ b/tests/Fixtures/Php81TestClass.php
@@ -8,12 +8,14 @@
 class Php81TestClass
 {
     public readonly string $a;
-    private readonly string $b;
+    protected readonly string $b;
+    private readonly string $c;
 
     public function __construct(string $a)
     {
         $this->a = $a;
         $this->b = $a.$a;
+        $this->c = $a.$a.$a;
     }
 
     public function typeHints(X & Y $p1)
diff --git a/tests/Parser/ParserTest.php b/tests/Parser/ParserTest.php
index 570d5b8ae..f2c06d883 100644
--- a/tests/Parser/ParserTest.php
+++ b/tests/Parser/ParserTest.php
@@ -491,6 +491,9 @@ public function testParseObjectIncomplete()
         $this->assertSame('test', $val[1]->value->contents);
     }
 
+    /**
+     * @covers \Kint\Parser\Parser::parseObject
+     */
     public function testParseObjectReadonly()
     {
         if (!KINT_PHP81) {
@@ -511,6 +514,8 @@ public function testParseObjectReadonly()
         $this->assertTrue($val[0]->readonly);
         $this->assertSame('b', $val[1]->name);
         $this->assertTrue($val[1]->readonly);
+        $this->assertSame('c', $val[2]->name);
+        $this->assertTrue($val[2]->readonly);
     }
 
     /**