diff --git a/configure/tailscale.sh b/configure/tailscale.sh
index 3a8161d..347bed4 100644
--- a/configure/tailscale.sh
+++ b/configure/tailscale.sh
@@ -1 +1,2 @@
+#!/bin/sh
 tailscale up --advertise-routes="$subnet" --accept-routes --advertise-exit-node