diff --git a/make-tom.sh b/make-tom.sh
index 4c1abae..44080ec 100755
--- a/make-tom.sh
+++ b/make-tom.sh
@@ -1,5 +1,6 @@
 #! /bin/sh
 
+set -eo pipefail
 bold=$(tput bold)
 normal=$(tput sgr0)