diff --git a/build/make.py b/build/make.py
index 75f0b7b..15cce9b 100644
--- a/build/make.py
+++ b/build/make.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2019 The Hafnium Authors.
 #