diff --git a/build.sh b/build.sh
index f98b8e8..7fcfbcc 100755
--- a/build.sh
+++ b/build.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh -e
 
 echo "Cleaning.."
 rm -f ./bin/uxnasm