diff --git a/rules-tests/Php81/Rector/Property/ReadOnlyPropertyRector/Fixture/skip_no_type.php.inc b/rules-tests/Php81/Rector/Property/ReadOnlyPropertyRector/Fixture/skip_no_type.php.inc
new file mode 100644
index 00000000000..48221146bd8
--- /dev/null
+++ b/rules-tests/Php81/Rector/Property/ReadOnlyPropertyRector/Fixture/skip_no_type.php.inc
@@ -0,0 +1,18 @@
+<?php
+
+namespace Rector\Tests\Php81\Rector\Property\ReadOnlyPropertyRector\Fixture;
+
+final class SkipNoType
+{
+    private $name;
+
+    public function __construct(string $name)
+    {
+        $this->name = $name;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+}
diff --git a/rules/Php81/Rector/Property/ReadOnlyPropertyRector.php b/rules/Php81/Rector/Property/ReadOnlyPropertyRector.php
index cc496943dc1..83511a0e2cd 100644
--- a/rules/Php81/Rector/Property/ReadOnlyPropertyRector.php
+++ b/rules/Php81/Rector/Property/ReadOnlyPropertyRector.php
@@ -93,6 +93,10 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
+        if ($node->type === null) {
+            return null;
+        }
+
         $this->visibilityManipulator->makeReadonly($node);
         return $node;
     }