diff --git a/tools/cpp-define-generator/make_header_test.py b/tools/cpp-define-generator/make_header_test.py
index a484285..4ce59d2 100755
--- a/tools/cpp-define-generator/make_header_test.py
+++ b/tools/cpp-define-generator/make_header_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright (C) 2018 The Android Open Source Project
 #