diff --git a/modules/theme/default.nix b/modules/theme/default.nix
index 90833a4..e38a7a6 100644
--- a/modules/theme/default.nix
+++ b/modules/theme/default.nix
@@ -25,6 +25,7 @@ in {
       description = ''
         Resolved scheme from the tinted-theming library.
       '';
+      readOnly = true;
       type = lib.types.attrs;
     };