diff --git a/flake.nix b/flake.nix
index a98b9a5..b1fe3fe 100644
--- a/flake.nix
+++ b/flake.nix
@@ -111,7 +111,7 @@
       overlays.culr = final: prev: let
         ocaml-deps = let
           inherit
-            (final.ocamlPackages)
+            (prev.ocamlPackages)
             dune_3
             ocaml
             angstrom