diff --git a/src/etc/licenseck.py b/src/etc/licenseck.py
index 63cde441e50..efaf820698c 100644
--- a/src/etc/licenseck.py
+++ b/src/etc/licenseck.py
@@ -25,7 +25,13 @@ license2="""\
 # You can obtain one at http://mozilla.org/MPL/2.0/.
 """
 
-license3 = """\
+license3="""\
+// 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/.
+"""
+
+license4 = """\
 // Copyright 2013 The Servo Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution.
 //
@@ -36,7 +42,7 @@ license3 = """\
 // except according to those terms.
 """
 
-license4 = """\
+license5 = """\
 # Copyright 2013 The Servo Project Developers. See the COPYRIGHT
 # file at the top-level directory of this distribution.
 #
@@ -47,7 +53,7 @@ license4 = """\
 # except according to those terms.
 """
 
-licenses = [license0, license1, license2, license3, license4]
+licenses = [license0, license1, license2, license3, license4, license5]
 
 exceptions = [
     "rust-http-client/http_parser.c", # BSD, Joyent