diff --git a/krebs/3modules/exim-retiolum.nix b/krebs/3modules/exim-retiolum.nix
index 8b6ac4a4e..d6b7ab753 100644
--- a/krebs/3modules/exim-retiolum.nix
+++ b/krebs/3modules/exim-retiolum.nix
@@ -57,6 +57,8 @@ let
           syslog_timestamp = false
           syslog_duplication = false
 
+          tls_advertise_hosts =
+
           begin acl
 
           acl_check_rcpt: