diff --git a/target/linux/mediatek/image/gen_mtk_mmc_img.sh b/target/linux/mediatek/image/gen_mtk_mmc_img.sh
index ea8a9c63a18..2dacb9019d6 100755
--- a/target/linux/mediatek/image/gen_mtk_mmc_img.sh
+++ b/target/linux/mediatek/image/gen_mtk_mmc_img.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 # Copyright © 2019 Alexey Loukianov <lx2@lexa2.ru>
 # Copyright © 2020 David Woodhouse <dwmw2@infradead.org>