diff --git a/samples/WebIDL/Fetch.webidl b/samples/WebIDL/Fetch.webidl
index fb022126..87a4e957 100644
--- a/samples/WebIDL/Fetch.webidl
+++ b/samples/WebIDL/Fetch.webidl
@@ -1,4 +1,4 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* -*- Mode: linguist-disable-strategy-modeline-IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/.