diff --git a/nix/module.nix b/nix/module.nix
index 73f3702..4c54c46 100644
--- a/nix/module.nix
+++ b/nix/module.nix
@@ -637,7 +637,7 @@ in
   in mkIf cfg.enable {
 
     # nixpkgs.overlays = if cfg.overlay.enable then [ self.overlay ] else null;
-    nixpkgs.overlays = lib.optionals cfg.overlay.enable [ self.overlay ];
+    nixpkgs.overlays = lib.mkIf cfg.overlay.enable [ self.overlay ];
 
     home.packages = [
       package