diff --git a/python/tidy/servo_tidy/licenseck.py b/python/tidy/servo_tidy/licenseck.py
index 03113da507d..75819bcefd2 100644
--- a/python/tidy/servo_tidy/licenseck.py
+++ b/python/tidy/servo_tidy/licenseck.py
@@ -31,6 +31,14 @@ licenses = [
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 """,
 
+"""\
+#!/usr/bin/env python3
+
+# 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/.
+""",
+
 """\
 // 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