diff --git a/flake.nix b/flake.nix
index 5afcf83..a8e9f6d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -109,7 +109,7 @@
       overlays.culr = final: _prev: let
         ocaml-deps = let
           inherit
-            (final.ocaml-ng)
+            (prev.ocaml-ng)
             dune_3
             ocaml
             angstrom