diff --git a/deploy/s3.sh b/deploy/s3.sh
index 685af5ac..14f1f6cd 100644
--- a/deploy/s3.sh
+++ b/deploy/s3.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 # This script deploys your cert to a s3 bucket.
 # export S3_BUCKET=acme