diff --git a/pkgs/development/ocaml-modules/typeconv/3.0.5.nix b/pkgs/development/ocaml-modules/typeconv/3.0.5.nix
new file mode 100644
index 000000000000..299e7729b91e
--- /dev/null
+++ b/pkgs/development/ocaml-modules/typeconv/3.0.5.nix
@@ -0,0 +1,23 @@
+{stdenv, fetchurl, ocaml, findlib}:
+
+# note: works only with ocaml >3.12
+
+stdenv.mkDerivation {
+  name = "ocaml-typeconv-3.0.5";
+
+  src = fetchurl {
+    url = "http://forge.ocamlcore.org/frs/download.php/821/type_conv-3.0.5.tar.gz";
+    sha256 = "90ac6c401a600a23012a3f513def6f67d4979b11bd551f4d0af78f0f0b479198";
+  };
+
+  buildInputs = [ocaml findlib ]; 
+
+  createFindlibDestdir = true;
+
+  meta = {
+    homepage = "http://forge.ocamlcore.org/projects/type-conv/";
+    description = "Support library for OCaml preprocessor type conversions";
+    license = "LGPL";
+    platforms = ocaml.meta.platforms;
+  };
+}
diff --git a/pkgs/development/ocaml-modules/typeconv/default.nix b/pkgs/development/ocaml-modules/typeconv/default.nix
index 299e7729b91e..33e30f5d5c8e 100644
--- a/pkgs/development/ocaml-modules/typeconv/default.nix
+++ b/pkgs/development/ocaml-modules/typeconv/default.nix
@@ -1,13 +1,11 @@
 {stdenv, fetchurl, ocaml, findlib}:
 
-# note: works only with ocaml >3.12
-
 stdenv.mkDerivation {
-  name = "ocaml-typeconv-3.0.5";
+  name = "ocaml-typeconv-109.60.01";
 
   src = fetchurl {
-    url = "http://forge.ocamlcore.org/frs/download.php/821/type_conv-3.0.5.tar.gz";
-    sha256 = "90ac6c401a600a23012a3f513def6f67d4979b11bd551f4d0af78f0f0b479198";
+    url = https://github.com/janestreet/type_conv/archive/109.60.01.tar.gz;
+    sha256 = "0lpxri68glgq1z2pp02rp45cb909xywbff8d4idljrf6fzzil2zx";
   };
 
   buildInputs = [ocaml findlib ]; 
@@ -17,7 +15,8 @@ stdenv.mkDerivation {
   meta = {
     homepage = "http://forge.ocamlcore.org/projects/type-conv/";
     description = "Support library for OCaml preprocessor type conversions";
-    license = "LGPL";
+    license = stdenv.lib.licenses.lgpl21;
     platforms = ocaml.meta.platforms;
+    maintainers = with stdenv.lib.maintainers; [ z77z ];
   };
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index b1fb47c9be75..e4bc8845c072 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2939,6 +2939,8 @@ let
 
     ocaml_typeconv = callPackage ../development/ocaml-modules/typeconv { };
 
+    ocaml_typeconv_3_0_5 = callPackage ../development/ocaml-modules/typeconv/3.0.5.nix { };
+
     ocaml_sexplib = callPackage ../development/ocaml-modules/sexplib { };
 
     ocaml_extlib = callPackage ../development/ocaml-modules/extlib { };