diff --git a/rules-tests/CodeQuality/Rector/ClassMethod/OptionalParametersAfterRequiredRector/Fixture/with_closure.php.inc b/rules-tests/CodeQuality/Rector/ClassMethod/OptionalParametersAfterRequiredRector/Fixture/with_closure.php.inc
new file mode 100644
index 00000000000..31da5e8a3da
--- /dev/null
+++ b/rules-tests/CodeQuality/Rector/ClassMethod/OptionalParametersAfterRequiredRector/Fixture/with_closure.php.inc
@@ -0,0 +1,19 @@
+<?php
+
+namespace Rector\Tests\CodeQuality\Rector\ClassMethod\OptionalParametersAfterRequiredRector\Fixture;
+
+function ($a = 1, $b) {
+
+};
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\CodeQuality\Rector\ClassMethod\OptionalParametersAfterRequiredRector\Fixture;
+
+function ($a = 1, $b = null) {
+
+};
+
+?>
diff --git a/rules/CodeQuality/Rector/ClassMethod/OptionalParametersAfterRequiredRector.php b/rules/CodeQuality/Rector/ClassMethod/OptionalParametersAfterRequiredRector.php
index ef8b81f187e..5dc2fb3624e 100644
--- a/rules/CodeQuality/Rector/ClassMethod/OptionalParametersAfterRequiredRector.php
+++ b/rules/CodeQuality/Rector/ClassMethod/OptionalParametersAfterRequiredRector.php
@@ -7,6 +7,7 @@
 use PhpParser\Node;
 use PhpParser\Node\ComplexType;
 use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\Closure;
 use PhpParser\Node\Expr\ConstFetch;
 use PhpParser\Node\Identifier;
 use PhpParser\Node\IntersectionType;
@@ -58,13 +59,13 @@ public function run($optional = 1, $required = null)
      */
     public function getNodeTypes(): array
     {
-        return [ClassMethod::class, Function_::class];
+        return [ClassMethod::class, Function_::class, Closure::class];
     }
 
     /**
-     * @param ClassMethod|Function_ $node
+     * @param ClassMethod|Function_|Closure $node
      */
-    public function refactor(Node $node): ClassMethod|Function_|null
+    public function refactor(Node $node): ClassMethod|Function_|Closure|null
     {
         if ($node->params === []) {
             return null;