diff --git a/publish.sh b/publish.sh
index 30994222..0cb5b100 100755
--- a/publish.sh
+++ b/publish.sh
@@ -1,7 +1,8 @@
 #!/usr/bin/env bash
 
-SITE_ENV="prod"
+set -uex
 
+SITE_ENV="prod"
 REPO=`git config remote.origin.url`
 SSH_REPO=${REPO/https:\/\/github.com\//git@github.com:}
 SHA=`git rev-parse --verify HEAD`