diff --git a/tools/_copy.sh b/tools/_copy.sh
index 7f71eba..c925a3a 100644
--- a/tools/_copy.sh
+++ b/tools/_copy.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright 2018 The Bazel Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");