diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index 72aecda9..4dbf7343 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -500,6 +500,7 @@ in
         "forum.m-labs.hk"
         "perso.m-labs.hk"
         "call.m-labs.hk"
+        "rt.m-labs.hk"
         "nmigen.org"
         "www.nmigen.org"
       ];