diff --git a/files/etc/cron.daily/realip b/files/etc/cron.daily/realip
index d9c4b62..fea3c30 100755
--- a/files/etc/cron.daily/realip
+++ b/files/etc/cron.daily/realip
@@ -1,5 +1,5 @@
-#!/bin/sh
-set -e
+#!/bin/bash
+set -eo pipefail
 
 T=`mktemp`