diff --git a/firmware/tools/make_image_chunk.py b/firmware/tools/make_image_chunk.py
index 5bcf4fb4..4ad18192 100755
--- a/firmware/tools/make_image_chunk.py
+++ b/firmware/tools/make_image_chunk.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.