diff --git a/install/debian/10/roundcube/main.inc.php b/install/debian/10/roundcube/main.inc.php
index 97cdbf2d..55a4e082 100644
--- a/install/debian/10/roundcube/main.inc.php
+++ b/install/debian/10/roundcube/main.inc.php
@@ -209,7 +209,7 @@ $rcmail_config['message_cache_lifetime'] = '10d';
 // enforce connections over https
 // with this option enabled, all non-secure connections will be redirected.
 // set the port for the ssl connection as value of this option if it differs from the default 443
-$rcmail_config['force_https'] = false;
+$rcmail_config['force_https'] = true;
 
 // tell PHP that it should work as under secure connection
 // even if it doesn't recognize it as secure ($_SERVER['HTTPS'] is not set)