diff --git a/src/StackMiddleware/FormatSetter.php b/src/StackMiddleware/FormatSetter.php
index 4896e9e..08545e5 100644
--- a/src/StackMiddleware/FormatSetter.php
+++ b/src/StackMiddleware/FormatSetter.php
@@ -34,10 +34,6 @@ final class FormatSetter implements HttpKernelInterface {
    * {@inheritdoc}
    */
   public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = TRUE) {
-    $accepted = AcceptHeader::fromString($request->headers->get('Accept'));
-    if ($accepted->get('application/vnd.api+json')) {
-      $request->setRequestFormat('api_json');
-    }
     return $this->httpKernel->handle($request, $type, $catch);
   }