diff --git a/samples/dhparam/params.sh b/samples/dhparam/params.sh
index 8e4f031..6eb0830 100755
--- a/samples/dhparam/params.sh
+++ b/samples/dhparam/params.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 openssl dhparam -2 -out dh-512.pem  -outform PEM 512
 openssl dhparam -2 -out dh-1024.pem -outform PEM 1024