diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index dc3552787c7..d5e13f3789b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -5111,7 +5111,7 @@ in
     nodejs = nodejs-4_x;
   };
 
-  inherit (ocamlPackages) opam;
+  opam = callPackage ../development/tools/ocaml/opam { };
 
   picat = callPackage ../development/compilers/picat {
     stdenv = overrideCC stdenv gcc49;
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index c88b2135525..a2a1add4f6d 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -625,8 +625,6 @@ let
 
     ocaml-top = callPackage ../development/tools/ocaml/ocaml-top { };
 
-    opam = callPackage ../development/tools/ocaml/opam { };
-
     ocamlnat = callPackage  ../development/ocaml-modules/ocamlnat { };
 
     trv = callPackage ../development/tools/misc/trv { };