diff --git a/contrib/dnsupdate b/contrib/dnsupdate
index 73844111..08238786 100644
--- a/contrib/dnsupdate
+++ b/contrib/dnsupdate
@@ -3,6 +3,8 @@
 # puts the result in the dns zone of a Bind9.
 # bitcoin-seeder: https://github.com/sipa/bitcoin-seeder
 
+set -euo pipefail
+
 # Zone to request from bintcoin-seeder
 ZONE=dnsseed.example.com
 # Filters to fetch