diff --git a/target/linux/rb532/image/gen_image.sh b/target/linux/rb532/image/gen_image.sh
index a9d48d86ca..e46539fd85 100755
--- a/target/linux/rb532/image/gen_image.sh
+++ b/target/linux/rb532/image/gen_image.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 OUTPUT="$1"
 KERNELSIZE="$2"
 KERNELIMAGE="$3"