diff --git a/nixos/modules/services/hardware/kmonad.nix b/nixos/modules/services/hardware/kmonad.nix
index 41e4ffe2a6a9..cea9aafb377f 100644
--- a/nixos/modules/services/hardware/kmonad.nix
+++ b/nixos/modules/services/hardware/kmonad.nix
@@ -94,7 +94,7 @@ let
       '';
     in
     pkgs.writeTextFile {
-      name = "${mkName keyboard.name}.cfg";
+      name = "${mkName keyboard.name}.kbd";
       text = lib.optionalString keyboard.defcfg.enable (defcfg + "\n") + keyboard.config;
       checkPhase = "${cfg.package}/bin/kmonad -d $out";
     };