diff --git a/flake.nix b/flake.nix
index 0b3ebd3..5946319 100644
--- a/flake.nix
+++ b/flake.nix
@@ -37,7 +37,7 @@
         };
         flake = {
           overlays.default = final: _prev: {
-            flake_env = final.callPackage ./default.nix { };
+            flake_env = final.ocamlPackages.callPackage ./default.nix { };
           };
         };
       });