diff --git a/hosts/shared/dconf.nix b/hosts/shared/dconf.nix
index 10db9ae..6e45fea 100644
--- a/hosts/shared/dconf.nix
+++ b/hosts/shared/dconf.nix
@@ -9,10 +9,13 @@ in {
   options.alqueva.system.dconf = {
     enable = lib.mkEnableOption "configuration with DConf";
     luminosity = lib.mkOption {
-      type = types.enum ["dark" "light"];
+      type = types.enum ["dark" "light" "default"];
       default = "dark";
       description = "The luminosity you want to use for GTK.";
-      apply = lum: "prefer-${lum}";
+      apply = lum:
+        if lum == "default"
+        then lum
+        else "prefer-${lum}";
     };
     theme = lib.mkOption {
       type = types.str;