diff --git a/flake.nix b/flake.nix
index a8e9f6d..b23e533 100644
--- a/flake.nix
+++ b/flake.nix
@@ -106,7 +106,7 @@
     // {
       nixosModules.culr = import ./nix/module.nix {culrOverlay = self.overlays.culr;};
 
-      overlays.culr = final: _prev: let
+      overlays.culr = final: prev: let
         ocaml-deps = let
           inherit
             (prev.ocaml-ng)