diff --git a/templates/docker-compose.yml b/templates/docker-compose.yml
index 19c8649..7abc88b 100644
--- a/templates/docker-compose.yml
+++ b/templates/docker-compose.yml
@@ -1,6 +1,4 @@
 # {{ ansible_managed }}
-version: '3.3'
-
 services:
   roundcubemail:
     image: roundcube/roundcubemail:{{ docker_roundcube_version }}
@@ -30,6 +28,7 @@ services:
       - ROUNDCUBEMAIL_DB_PASSWORD={{ docker_roundcube_db_password }}
       - ROUNDCUBEMAIL_SKIN=elastic
       - ROUNDCUBEMAIL_DEFAULT_HOST=ssl://{{ docker_roundcube_mail_server }}
+      - ROUNDCUBEMAIL_DEFAULT_PORT=993
       - ROUNDCUBEMAIL_SMTP_SERVER=tls://{{ docker_roundcube_mail_server }}
       - ROUNDCUBEMAIL_UPLOAD_MAX_FILESIZE={{ docker_roundcube_maxfilesize }}
       - ROUNDCUBEMAIL_PLUGINS={{ docker_roundcube_plugins }}