diff --git a/dnsapi/dns_openprovider.sh b/dnsapi/dns_openprovider.sh
index 84058f60..0a9e5ade 100755
--- a/dnsapi/dns_openprovider.sh
+++ b/dnsapi/dns_openprovider.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env sh
 
 # This is the OpenProvider API wrapper for acme.sh
 #