diff --git a/flake.nix b/flake.nix
index 4fd98da..12bcdb7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -40,7 +40,7 @@
         };
         flake = {
           overlays.default = final: _prev: {
-            flake_env = final.ocamlPackages.callPackage ./default.nix { };
+            flake_env = final.ocamlPackages.callPackage ./default.nix { inherit nix-filter; };
           };
         };
       });