diff --git a/tools/buildgen/build_cleaner.py b/tools/buildgen/build_cleaner.py
index b27da7c2699..b044cb7da9b 100755
--- a/tools/buildgen/build_cleaner.py
+++ b/tools/buildgen/build_cleaner.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2.7
+#!/usr/bin/env python3
 # Copyright 2015 gRPC authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");