diff --git a/pkgs/development/ocaml-modules/jsonm/default.nix b/pkgs/development/ocaml-modules/jsonm/default.nix
index f473527c15c..fb73df808fe 100644
--- a/pkgs/development/ocaml-modules/jsonm/default.nix
+++ b/pkgs/development/ocaml-modules/jsonm/default.nix
@@ -1,24 +1,23 @@
-{ stdenv, fetchurl, ocaml, findlib, ocamlbuild, uutf }:
+{ stdenv, fetchurl, ocaml, findlib, ocamlbuild, topkg, opam, uutf }:
 
-let version = "0.9.1"; in
+let version = "1.0.0"; in
 
 stdenv.mkDerivation {
-  name = "ocaml-jsonm-${version}";
+  name = "ocaml${ocaml.version}-jsonm-${version}";
 
   src = fetchurl {
     url = "http://erratique.ch/software/jsonm/releases/jsonm-${version}.tbz";
-    sha256 = "0wszqrmx8iqlwzvs76fjf4sqh15mv20yjrbyhkd348yq8nhdrm1z";
+    sha256 = "1v3ln6d965lplj28snjdqdqablpp1kx8bw2cfx0m6i157mqyln62";
   };
 
-  buildInputs = [ ocaml findlib ocamlbuild ];
+  buildInputs = [ ocaml findlib ocamlbuild topkg opam ];
   propagatedBuildInputs = [ uutf ];
 
   unpackCmd = "tar xjf $src";
 
-  configurePhase = "ocaml setup.ml -configure --prefix $prefix";
-  buildPhase = "ocaml setup.ml -build";
   createFindlibDestdir = true;
-  installPhase = "ocaml setup.ml -install";
+
+  inherit (topkg) buildPhase installPhase;
 
   meta = {
     description = "An OCaml non-blocking streaming codec to decode and encode the JSON data format";