diff --git a/samples/certs/all.sh b/samples/certs/all.sh
index ac62af1..8c842dc 100755
--- a/samples/certs/all.sh
+++ b/samples/certs/all.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env sh
 ./rootA.sh
 ./rootB.sh
 ./clientA.sh