diff --git a/pkgs/by-name/he/heptagon/package.nix b/pkgs/by-name/he/heptagon/package.nix
index 84c4ad9906003..d78715399be85 100644
--- a/pkgs/by-name/he/heptagon/package.nix
+++ b/pkgs/by-name/he/heptagon/package.nix
@@ -3,10 +3,12 @@
   stdenv,
   fetchFromGitLab,
   makeWrapper,
-  ocamlPackages,
+  ocaml-ng,
   fetchpatch,
 }:
-
+let
+  ocamlPackages = ocaml-ng.ocamlPackages_5_3;
+in
 stdenv.mkDerivation (finalAttrs: {
   pname = "heptagon";
   version = "1.05.00";
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 1741a298f2307..b65c96908e1ba 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4329,10 +4329,6 @@ with pkgs;
   haxePackages = recurseIntoAttrs (callPackage ./haxe-packages.nix { });
   inherit (haxePackages) hxcpp;
 
-  heptagon = callPackage ../by-name/he/heptagon/package.nix {
-    ocamlPackages = ocaml-ng.ocamlPackages_5_3;
-  };
-
   dotnetPackages = recurseIntoAttrs (callPackage ./dotnet-packages.nix { });
 
   gwe = callPackage ../tools/misc/gwe {