diff --git a/linode-auth-hook.sh b/linode-auth-hook.sh
index 7415522..4324248 100644
--- a/linode-auth-hook.sh
+++ b/linode-auth-hook.sh
@@ -3,7 +3,7 @@
 #echo $CERTBOT_VALIDATION
 #echo $CERTBOT_TOKEN
 
-DOMAIN_ID=`linode-cli domains list|grep $CERTBOT_DOMAIN|awk -F' ' '{print $2}'`
+DOMAIN_ID=`linode-cli domains list|grep -e "\s$CERTBOT_DOMAIN\s"|awk -F' ' '{print $2}'`
 
 linode-cli domains records-create --type TXT --name "_acme-challenge" --ttl_sec 60 --target "$CERTBOT_VALIDATION" $DOMAIN_ID