diff --git a/pkgs/development/ocaml-modules/type_conv/109.60.01.nix b/pkgs/development/ocaml-modules/type_conv/109.60.01.nix
index cc77a731f020..4ec160a92230 100644
--- a/pkgs/development/ocaml-modules/type_conv/109.60.01.nix
+++ b/pkgs/development/ocaml-modules/type_conv/109.60.01.nix
@@ -1,4 +1,4 @@
-{ stdenv, lib, fetchurl, ocaml, findlib, camlp4 }:
+{ stdenv, lib, fetchFromGitHub, ocaml, findlib, camlp4 }:
 
 if !lib.versionAtLeast ocaml.version "4.00"
   || lib.versionAtLeast ocaml.version "4.03"
@@ -8,9 +8,11 @@ stdenv.mkDerivation rec {
   pname = "ocaml-type_conv";
   version = "109.60.01";
 
-  src = fetchurl {
-    url = "https://github.com/janestreet/type_conv/archive/${version}.tar.gz";
-    sha256 = "0lpxri68glgq1z2pp02rp45cb909xywbff8d4idljrf6fzzil2zx";
+  src = fetchFromGitHub {
+    owner = "janestreet";
+    repo = "type_conv";
+    rev = version;
+    sha256 = "sha256-8Oz/fPL3+RghyxQp5u6seSEdf0BgfP6XNcsMYty0rNs=";
   };
 
   buildInputs = [ ocaml findlib camlp4 ];
diff --git a/pkgs/development/ocaml-modules/type_conv/112.01.01.nix b/pkgs/development/ocaml-modules/type_conv/112.01.01.nix
index c71bfa00e7ef..e90ca2d16a64 100644
--- a/pkgs/development/ocaml-modules/type_conv/112.01.01.nix
+++ b/pkgs/development/ocaml-modules/type_conv/112.01.01.nix
@@ -1,4 +1,4 @@
-{ lib, fetchurl, buildOcaml}:
+{ lib, fetchFromGitHub, buildOcaml}:
 
 buildOcaml rec {
   minimumSupportedOcamlVersion = "4.02";
@@ -6,9 +6,11 @@ buildOcaml rec {
   pname = "type_conv";
   version = "113.00.02";
 
-  src = fetchurl {
-    url = "https://github.com/janestreet/type_conv/archive/${version}.tar.gz";
-    sha256 = "1718yl2q8zandrs4xqffkfmssfld1iz62dzcqdm925735c1x01fk";
+  src = fetchFromGitHub {
+    owner = "janestreet";
+    repo = "type_conv";
+    rev = version;
+    sha256 = "sha256-HzH0hnceCQ2kDRATjl+tfKk3XSBDsGnPzVUGYpDQUmU=";
   };
 
   meta = {