diff --git a/defaults/main.yml b/defaults/main.yml
index 430ab1f..34b524f 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -22,11 +22,11 @@ roundcube_db_name:
 roundcube_data_dir: /var/www/html
 
 # imap
-roundcube_imap_host: "{{ dovecot_container | default('localhost') }}"
+roundcube_imap_host: "tls://{{ dovecot_container | default('localhost') }}"
 roundcube_imap_port: "143"
 
 # smtp
-roundcube_smtp_host: "{{ dovecot_container | default('localhost') }}"
+roundcube_smtp_host: "tls://{{ dovecot_container | default('localhost') }}"
 roundcube_smtp_port: "587"
 
 # plugins