diff --git a/linode-cleanup-hook.sh b/linode-cleanup-hook.sh
index f06e826..f249747 100644
--- a/linode-cleanup-hook.sh
+++ b/linode-cleanup-hook.sh
@@ -3,7 +3,7 @@
 #echo $CERTBOT_VALIDATION
 #echo $CERTBOT_TOKEN
 
-DOMAIN_ID=`linode-cli domains list|grep $CERTBOT_DOMAIN|awk -F' ' '{print $2}'`
-RECORD_ID=`linode-cli domains records-list $DOMAIN_ID|grep _acme-challenge|grep $CERTBOT_VALIDATION|awk -F' ' '{print $2}'`
+DOMAIN_ID=`linode-cli domains list|grep -e "\s$CERTBOT_DOMAIN\s"|awk -F' ' '{print $2}'`
+RECORD_ID=`linode-cli domains records-list $DOMAIN_ID|grep -e "\s_acme-challenge\s"|grep -e "\s$CERTBOT_VALIDATION\s"|awk -F' ' '{print $2}'`
 
 linode-cli domains records-delete $DOMAIN_ID $RECORD_ID