diff --git a/tools/appliance/build.sh b/tools/appliance/build.sh
index 38d71fd00d0..4dcb200915e 100644
--- a/tools/appliance/build.sh
+++ b/tools/appliance/build.sh
@@ -1,3 +1,4 @@
+#!/bin/bash -xl
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file
 # distributed with this work for additional information