diff --git a/unifi-nvr-upgrade b/unifi-nvr-upgrade
index 6c00c4c..990eba2 100644
--- a/unifi-nvr-upgrade
+++ b/unifi-nvr-upgrade
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 service unifi-video stop;
 apt-get clean;
 rm /etc/apt/sources.list;