diff --git a/aws-lc-sys/builder/prebuilt-nasm.sh b/aws-lc-sys/builder/prebuilt-nasm.sh
index a678d0a5dfe..541f70c338e 100755
--- a/aws-lc-sys/builder/prebuilt-nasm.sh
+++ b/aws-lc-sys/builder/prebuilt-nasm.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0 OR ISC