diff --git a/bootstrap.sh b/bootstrap.sh
index d5b5ca1..651f397 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/sh -eu
 # bootstrap.sh -- a Devuan base image
 # Copyright (C) 2017  Olaf Meeuwissen
 #