diff --git a/api/types/installers/installer.sh.tmpl b/api/types/installers/installer.sh.tmpl
index 3232f69d11132..d2b880410c5e6 100644
--- a/api/types/installers/installer.sh.tmpl
+++ b/api/types/installers/installer.sh.tmpl
@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -eu
+
 on_ec2() {
   EC2_STATUS=$(curl -o /dev/null -w "%{http_code}" -m5 -sS "http://169.254.169.254/latest/meta-data")
   # EC2 metadata sometimes requires token access, so a successful hit may