diff --git a/cluster b/cluster
index ca8b904bd..0dc07755f 100644
--- a/cluster
+++ b/cluster
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env sh
 
 SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"