diff --git a/rules-tests/Transform/Rector/FileWithoutNamespace/RectorConfigBuilderRector/Fixture/disable_parallel_to_without_parallel.php.inc b/rules-tests/Transform/Rector/FileWithoutNamespace/RectorConfigBuilderRector/Fixture/disable_parallel_to_without_parallel.php.inc
new file mode 100644
index 00000000000..612682860ed
--- /dev/null
+++ b/rules-tests/Transform/Rector/FileWithoutNamespace/RectorConfigBuilderRector/Fixture/disable_parallel_to_without_parallel.php.inc
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->disableParallel();
+};
+
+?>
+-----
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+
+return \Rector\Config\RectorConfig::configure()->withoutParallel();
+
+?>
diff --git a/rules/Transform/Rector/FileWithoutNamespace/RectorConfigBuilderRector.php b/rules/Transform/Rector/FileWithoutNamespace/RectorConfigBuilderRector.php
index cf556b4cf3a..52021b979df 100644
--- a/rules/Transform/Rector/FileWithoutNamespace/RectorConfigBuilderRector.php
+++ b/rules/Transform/Rector/FileWithoutNamespace/RectorConfigBuilderRector.php
@@ -114,9 +114,17 @@ public function refactor(Node $node): ?Node
                 }
 
                 $args = $rectorConfigStmt->expr->getArgs();
-                $value = $args[0]->value;
                 $name = $this->getName($rectorConfigStmt->expr->name);
 
+                if ($name === 'disableParallel') {
+                    $newExpr = $this->nodeFactory->createMethodCall($newExpr, 'withoutParallel');
+                    $hasChanged = true;
+
+                    continue;
+                }
+
+                $value = $args[0]->value;
+
                 if ($name === 'rule') {
                     Assert::isAOf($rules, Array_::class);
                     $rules->items[] = new ArrayItem($value);