diff --git a/wireguard-go/on_boot.d/20-wireguard.sh b/wireguard-go/on_boot.d/20-wireguard.sh
index dd3c725..ee01b34 100644
--- a/wireguard-go/on_boot.d/20-wireguard.sh
+++ b/wireguard-go/on_boot.d/20-wireguard.sh
@@ -1 +1,3 @@
+#!/bin/sh
+
 podman run -i -d --rm --net=host --name wireguard --privileged -v /mnt/data/wireguard:/etc/wireguard -v /dev/net/tun:/dev/net/tun  -e LOG_LEVEL=info -e WG_COLOR_MODE=always masipcat/wireguard-go