diff --git a/build.sh b/build.sh
index 5ea65d423bd6bca362aa77bcfd7aaa96817c6732..90ca1083c3e1fed60037213df98c8a52fdb0793e 100755
--- a/build.sh
+++ b/build.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 declare -r name=${1:-docker.seblu.net/docker/dokuwiki}
 # Dokuwiki upstream consider the last reliable version to be rc when available.
 # The update_check in dokuwiki is always looking for RC too.