diff --git a/src/mailserver/Containerfile b/src/mailserver/Containerfile
index 2ff6b4d..950ecb5 100644
--- a/src/mailserver/Containerfile
+++ b/src/mailserver/Containerfile
@@ -9,7 +9,7 @@ LABEL deployopts="\
 -p 25:25 \
 -p 465:465 \
 -p 143:143 \
--p 993:993
+-p 993:993 \
 -v /srv/volumes/mailserver/db:/vol/db \
 -v /srv/volumes/mailserver/mail:/vol/mail \
 -v /etc/letsencrypt:/vol/ssl"