diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 21e0d787c808..b41e37fc1534 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16404,7 +16404,9 @@ with pkgs;
     inherit (emacs.pkgs.melpaStablePackages) irony;
   };
 
-  heptagon = callPackage ../development/compilers/heptagon { };
+  heptagon = callPackage ../development/compilers/heptagon {
+    ocamlPackages = ocaml-ng.ocamlPackages_4_14;
+  };
 
   holo-build = callPackage ../tools/package-management/holo-build { };