diff --git a/target/linux/at91/image/gen_at91_sdcard_img.sh b/target/linux/at91/image/gen_at91_sdcard_img.sh
index 4eb30fa790d..5171b6723ec 100755
--- a/target/linux/at91/image/gen_at91_sdcard_img.sh
+++ b/target/linux/at91/image/gen_at91_sdcard_img.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 #
 # Copyright (C) 2017 OpenWrt.org