diff --git a/machines/aramis/install.sh b/machines/aramis/install.sh
index 537ef9e..b03a6df 100755
--- a/machines/aramis/install.sh
+++ b/machines/aramis/install.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -eu
+
 if [ "$(id -u)" -ne 0 ]; then
     echo "This script must be run as root" >&2
     exit 1