diff --git a/default.nix b/default.nix
index 64fe8a8..95abb02 100644
--- a/default.nix
+++ b/default.nix
@@ -13,10 +13,10 @@ let
     sha256 = lockFile.nodes.lix-module.locked.narHash;
   };
 in
-args: 
+{ overlays ? [] } @ args: 
   import "${nixpkgs}" {
     overlays = [
       (import ./overlay.nix)
       (import "${lix-module}/overlay.nix" { inherit lix; })
-    ] ++ args.overlays;
+    ] ++ overlays;
   } // (builtins.removeAttrs args [ "overlays" ])