diff --git a/pkgs/by-name/ef/eff/package.nix b/pkgs/by-name/ef/eff/package.nix
index 88e4fa3e418a..a199255cc3b5 100644
--- a/pkgs/by-name/ef/eff/package.nix
+++ b/pkgs/by-name/ef/eff/package.nix
@@ -1,11 +1,11 @@
 {
   lib,
   fetchFromGitHub,
-  ocamlPackages,
+  ocaml-ng,
 }:
 
 let
-  inherit (ocamlPackages) buildDunePackage js_of_ocaml menhir;
+  inherit (ocaml-ng.ocamlPackages_5_2) buildDunePackage js_of_ocaml menhir;
 in
 
 buildDunePackage rec {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 82f81beedc87..9010c50c7b71 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -351,8 +351,6 @@ with pkgs;
     catch2 = catch2_3;
   };
 
-  eff = callPackage ../by-name/ef/eff/package.nix { ocamlPackages = ocaml-ng.ocamlPackages_5_2; };
-
   enochecker-test = with python3Packages; callPackage ../development/tools/enochecker-test { };
 
   inherit (gridlock) nyarr;