diff --git a/tools/perf_test_mask_password.py b/tools/perf_test_mask_password.py
index f323f618..677f67e3 100644
--- a/tools/perf_test_mask_password.py
+++ b/tools/perf_test_mask_password.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # All Rights Reserved.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License"); you may