diff --git a/rules-tests/Php74/Rector/Property/RestoreDefaultNullToNullableTypePropertyRector/Fixture/skip_readonly_class.php.inc b/rules-tests/Php74/Rector/Property/RestoreDefaultNullToNullableTypePropertyRector/Fixture/skip_readonly_class.php.inc
new file mode 100644
index 00000000000..43292772a80
--- /dev/null
+++ b/rules-tests/Php74/Rector/Property/RestoreDefaultNullToNullableTypePropertyRector/Fixture/skip_readonly_class.php.inc
@@ -0,0 +1,8 @@
+<?php
+
+namespace Rector\Tests\Php74\Rector\Property\RestoreDefaultNullToNullableTypePropertyRector\Fixture;
+
+final readonly class SkipReadonlyClass
+{
+    public string|null $display;
+}
diff --git a/rules/Php74/Rector/Property/RestoreDefaultNullToNullableTypePropertyRector.php b/rules/Php74/Rector/Property/RestoreDefaultNullToNullableTypePropertyRector.php
index 7545dfa7b37..c50ba6a896e 100644
--- a/rules/Php74/Rector/Property/RestoreDefaultNullToNullableTypePropertyRector.php
+++ b/rules/Php74/Rector/Property/RestoreDefaultNullToNullableTypePropertyRector.php
@@ -62,6 +62,10 @@ public function getNodeTypes(): array
      */
     public function refactor(Node $node): ?Node
     {
+        if ($node->isReadonly()) {
+            return null;
+        }
+
         $hasChanged = false;
 
         foreach ($node->getProperties() as $property) {