diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index 32eccf0..99aeacd 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -184,7 +184,11 @@ in
         name = "m-labs.hk";
         master = true;
         file = "/etc/nixos/named/m-labs.hk";
-        extraConfig = ''dnssec-policy "default";'';
+        extraConfig =
+           ''
+           dnssec-policy "default";
+           inline-signing yes;
+           '';
         slaves = [
           "213.239.220.50" "2a01:4f8:a0:7041::1"  # qnetp
         ];