diff --git a/Resources/config/services.yml b/Resources/config/services.yml
index 6a25f68ee..a56eef9ef 100644
--- a/Resources/config/services.yml
+++ b/Resources/config/services.yml
@@ -52,6 +52,8 @@ parameters:
     # To disable set to 0.
     ezsystems.platformui.application_config.combo_loader.cache_ttl: 604800
 
+    ezsystems.platformui.rest.generator.json.vendor: 'vnd.ez.platformui'
+
     ezsystems.platformui.rest.output.visitor.json.regexps:
         - '(^application/vnd\.ez\.platformui\.[A-Za-z]+\+json$)'
 services:
@@ -282,9 +284,10 @@ services:
             - { name: ezpublish_rest.field_type_processor, alias: ezuser }
 
     ezsystems.platformui.rest.output.generator.json:
-        class: EzSystems\PlatformUIBundle\Rest\Generator\Json
+        class: eZ\Publish\Core\REST\Common\Output\Generator\Json
         arguments:
             - "@ezpublish_rest.output.generator.json.field_type_hash_generator"
+            - "%ezsystems.platformui.rest.generator.json.vendor%"
         calls:
             - [ setFormatOutput, [ "%kernel.debug%" ] ]
 
diff --git a/Rest/Generator/Json.php b/Rest/Generator/Json.php
deleted file mode 100644
index 82eddb05c..000000000
--- a/Rest/Generator/Json.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-/**
- * @copyright Copyright (C) eZ Systems AS. All rights reserved.
- * @license For full copyright and license information view LICENSE file distributed with this source code.
- */
-namespace EzSystems\PlatformUIBundle\Rest\Generator;
-
-use eZ\Publish\Core\REST\Common\Output\Generator\Json as BaseJson;
-
-class Json extends BaseJson
-{
-    protected function generateMediaType($name, $type)
-    {
-        return "application/vnd.ez.platformui.{$name}+{$type}";
-    }
-}
diff --git a/Tests/Rest/Generator/JsonTest.php b/Tests/Rest/Generator/JsonTest.php
index 2ad505c52..6341877ca 100644
--- a/Tests/Rest/Generator/JsonTest.php
+++ b/Tests/Rest/Generator/JsonTest.php
@@ -7,14 +7,15 @@
 namespace EzSystems\PlatformUIBundle\Tests\Rest\Generator;
 
 use eZ\Publish\Core\REST\Common\Output\Generator\Json\FieldTypeHashGenerator;
-use EzSystems\PlatformUIBundle\Rest\Generator\Json;
+use eZ\Publish\Core\REST\Common\Output\Generator\Json;
 use PHPUnit\Framework\TestCase;
 
 class JsonTest extends TestCase
 {
     public function testGetMediaType()
     {
-        $mediaType = (new Json($this->getMock(FieldTypeHashGenerator::class)))->getMediaType('Object');
+        $vendor = 'vnd.ez.platformui';
+        $mediaType = (new Json($this->getMock(FieldTypeHashGenerator::class), $vendor))->getMediaType('Object');
 
         $this->assertEquals('application/vnd.ez.platformui.Object+json', $mediaType);
     }