diff --git a/lib/modules/windows.nix b/lib/modules/windows.nix
index c480e067..c6ff7c85 100644
--- a/lib/modules/windows.nix
+++ b/lib/modules/windows.nix
@@ -1,9 +1,10 @@
 { lib, config, ... }:
   let
     inherit (lib)
-      mkOption
+      mkDefault
       mkEnableOption
       mkIf
+      mkOption
       types
     ;
 
@@ -39,8 +40,8 @@
 
     config = {
       valhalla.windows = {
-        setupUser.name = capitalize config.valhalla.setupUser.name;
-        dualboot.linuxPercentage = mkIf (!config.valhalla.windows.dualboot.enable) 0;
+        setupUser.name = mkDefault (capitalize config.valhalla.setupUser.name);
+        dualboot.linuxPercentage = mkIf (!config.valhalla.windows.dualboot.enable) (mkDefault 0);
       };
     };
   }