diff --git a/src/contracts/Sets/ibexa-50.php b/src/contracts/Sets/ibexa-50.php
index d127313..ceccb47 100644
--- a/src/contracts/Sets/ibexa-50.php
+++ b/src/contracts/Sets/ibexa-50.php
@@ -63,7 +63,7 @@
                 'generateMediaTypeWithVendor'
             ),
             new MethodCallRename(
-                'Ibexa\Contracts\Rest\Output\Generator',
+                'Ibexa\Rest\Output\FieldTypeSerializer',
                 'serializeFieldValue',
                 'serializeContentFieldValue'
             ),
@@ -73,7 +73,7 @@
     $rectorConfig->ruleWithConfiguration(
         RemoveArgumentFromMethodCallRector::class,
         [
-            'class_name' => '\Ibexa\Rest\Output\FieldTypeSerializer',
+            'class_name' => 'Ibexa\Rest\Output\FieldTypeSerializer',
             'method_name' => 'serializeContentFieldValue',
             'argument_index_to_remove' => 1,
             'more_than' => 2,
diff --git a/tests/lib/Sets/Ibexa50/Fixture/rest_rename.php.inc b/tests/lib/Sets/Ibexa50/Fixture/rest_rename.php.inc
new file mode 100644
index 0000000..14235ad
--- /dev/null
+++ b/tests/lib/Sets/Ibexa50/Fixture/rest_rename.php.inc
@@ -0,0 +1,55 @@
+<?php
+
+namespace Ibexa\Rector\Tests\Sets\Ibexa50\Fixture;
+
+use Ibexa\Bundle\Core\ApiLoader\RepositoryConfigurationProvider;
+
+class Foo {
+    public function mediaTypeGenerator(): void
+    {
+        $generator = new \Ibexa\Contracts\Rest\Output\Generator();
+
+        return $generator->generateMediaType('name', 'type');
+    }
+
+    public function fieldTypeSerializer(): void
+    {
+        $serializer = new \Ibexa\Rest\Output\FieldTypeSerializer();
+
+        $generator = new \Ibexa\Contracts\Rest\Output\Generator();
+        $contentType = new \Ibexa\Contracts\Core\Repository\Values\ContentType\ContentType();
+        $field = new \Ibexa\Contracts\Core\Repository\Values\Content\Field();
+
+        return $serializer->serializeFieldValue($generator, $contentType, $field);
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Ibexa\Rector\Tests\Sets\Ibexa50\Fixture;
+
+use Ibexa\Bundle\Core\ApiLoader\RepositoryConfigurationProvider;
+
+class Foo {
+    public function mediaTypeGenerator(): void
+    {
+        $generator = new \Ibexa\Contracts\Rest\Output\Generator();
+
+        return $generator->generateMediaTypeWithVendor('name', 'type');
+    }
+
+    public function fieldTypeSerializer(): void
+    {
+        $serializer = new \Ibexa\Rest\Output\FieldTypeSerializer();
+
+        $generator = new \Ibexa\Contracts\Rest\Output\Generator();
+        $contentType = new \Ibexa\Contracts\Core\Repository\Values\ContentType\ContentType();
+        $field = new \Ibexa\Contracts\Core\Repository\Values\Content\Field();
+
+        return $serializer->serializeContentFieldValue($generator, $field);
+    }
+}
+
+?>