diff --git a/nixos/modules/services/x11/xserver.nix b/nixos/modules/services/x11/xserver.nix
index b2e348a218e9..a5b624fcfdb2 100644
--- a/nixos/modules/services/x11/xserver.nix
+++ b/nixos/modules/services/x11/xserver.nix
@@ -365,6 +365,7 @@ in
       };
 
       xkb = mkOption {
+        default = { };
         description = "X keyboard extension (XKB) configuration";
         type = types.submodule {
           options = {