diff --git a/lib/types/host.nix b/lib/types/host.nix
index 85681ab..6bcb76c 100644
--- a/lib/types/host.nix
+++ b/lib/types/host.nix
@@ -86,7 +86,6 @@ rec {
       master-key = mkOption {
         type = nullOr (submodule masterKeyOpts);
         description = "Public key for the host master key, used by the host to decrypt secrets.";
-        default = null;
       };
 
       domain = mkOption {