diff --git a/script/protofmt.go b/script/protofmt.go
index be3ffe7cc..2ad35664b 100644
--- a/script/protofmt.go
+++ b/script/protofmt.go
@@ -1,3 +1,11 @@
+// Copyright (C) 2016 The Syncthing Authors.
+//
+// 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/.
+
+// +build ignore
+
 package main
 
 import (