diff --git a/Classes/Controller/GraphQLController.php b/Classes/Controller/GraphQLController.php
index 1402849..362a1ac 100644
--- a/Classes/Controller/GraphQLController.php
+++ b/Classes/Controller/GraphQLController.php
@@ -51,6 +51,15 @@ class GraphQLController extends ActionController
      */
     protected $requestLogger;
 
+    /**
+     * A list of IANA media types which are supported by this controller
+     *
+     * @see http://www.iana.org/assignments/media-types/index.html
+     *
+     * @var string[]
+     */
+    protected $supportedMediaTypes = ['application/json'];
+
     /**
      * phpcs:disable SlevomatCodingStandard.TypeHints.TypeHintDeclaration.MissingTraversableParameterTypeHintSpecification
      *