diff --git a/src/Closures/NoParameterWithNullDefaultValueRule.php b/src/Closures/NoParameterWithNullDefaultValueRule.php
index 063433e0..9a98aa52 100644
--- a/src/Closures/NoParameterWithNullDefaultValueRule.php
+++ b/src/Closures/NoParameterWithNullDefaultValueRule.php
@@ -48,9 +48,9 @@ public function processNode(
             return [];
         }
 
-        return \array_map(static function (Node\Param $node): Rules\RuleError {
+        return \array_map(static function (Node\Param $parameterWithNullDefaultValue): Rules\RuleError {
             /** @var Node\Expr\Variable $variable */
-            $variable = $node->var;
+            $variable = $parameterWithNullDefaultValue->var;
 
             /** @var string $parameterName */
             $parameterName = $variable->name;