diff --git a/pkgs/development/ocaml-modules/fieldslib/default.nix b/pkgs/development/ocaml-modules/fieldslib/default.nix
index 28b83d3af46f..385487903290 100644
--- a/pkgs/development/ocaml-modules/fieldslib/default.nix
+++ b/pkgs/development/ocaml-modules/fieldslib/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, ocaml_typeconv, camlp4 }:
+{ stdenv, fetchurl, ocaml, findlib, type_conv, camlp4 }:
 
 assert stdenv.lib.versionOlder "4.00" (stdenv.lib.getVersion ocaml);
 
@@ -11,7 +11,7 @@ stdenv.mkDerivation {
   };
 
   buildInputs = [ ocaml findlib ];
-  propagatedBuildInputs = [ ocaml_typeconv camlp4 ];
+  propagatedBuildInputs = [ type_conv camlp4 ];
 
   createFindlibDestdir = true;
 
diff --git a/pkgs/development/ocaml-modules/odn/default.nix b/pkgs/development/ocaml-modules/odn/default.nix
index bfffb67d4b0e..eaeb7e7b22f7 100644
--- a/pkgs/development/ocaml-modules/odn/default.nix
+++ b/pkgs/development/ocaml-modules/odn/default.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, ocaml, findlib, ocaml_typeconv, ounit, camlp4}:
+{stdenv, fetchurl, ocaml, findlib, type_conv, ounit, camlp4}:
 
 stdenv.mkDerivation {
   name = "ocaml-data-notation-0.0.11";
@@ -8,7 +8,7 @@ stdenv.mkDerivation {
     sha256 = "09a8zdyifpc2nl4hdvg9206142y31cq95ajgij011s1qcg3z93lj";
   };
 
-  buildInputs = [ocaml findlib ocaml_typeconv ounit camlp4];
+  buildInputs = [ocaml findlib type_conv ounit camlp4];
 
   createFindlibDestdir = true;
 
diff --git a/pkgs/development/ocaml-modules/sexplib/108.08.00.nix b/pkgs/development/ocaml-modules/sexplib/108.08.00.nix
index bde9c2713715..dd9e89bcef70 100644
--- a/pkgs/development/ocaml-modules/sexplib/108.08.00.nix
+++ b/pkgs/development/ocaml-modules/sexplib/108.08.00.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, ocaml, findlib, typeconv, camlp4}:
+{stdenv, fetchurl, ocaml, findlib, type_conv, camlp4}:
 
 let
   ocaml_version = (builtins.parseDrvName ocaml.name).version;
@@ -15,7 +15,7 @@ stdenv.mkDerivation {
   };
 
   buildInputs = [ocaml findlib];
-  propagatedBuildInputs = [typeconv camlp4];
+  propagatedBuildInputs = [type_conv camlp4];
 
   createFindlibDestdir = true;
 
diff --git a/pkgs/development/ocaml-modules/sexplib/default.nix b/pkgs/development/ocaml-modules/sexplib/default.nix
index a32c6a0e2ce6..f816f80e51ee 100644
--- a/pkgs/development/ocaml-modules/sexplib/default.nix
+++ b/pkgs/development/ocaml-modules/sexplib/default.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, ocaml, findlib, ocaml_typeconv, camlp4}:
+{stdenv, fetchurl, ocaml, findlib, type_conv, camlp4}:
 
 let
   ocaml_version = (builtins.parseDrvName ocaml.name).version;
@@ -15,7 +15,7 @@ stdenv.mkDerivation {
   };
 
   buildInputs = [ocaml findlib];
-  propagatedBuildInputs = [ocaml_typeconv camlp4];
+  propagatedBuildInputs = [type_conv camlp4];
 
   createFindlibDestdir = true;
 
diff --git a/pkgs/development/ocaml-modules/typeconv/108.08.00.nix b/pkgs/development/ocaml-modules/type_conv/108.08.00.nix
similarity index 95%
rename from pkgs/development/ocaml-modules/typeconv/108.08.00.nix
rename to pkgs/development/ocaml-modules/type_conv/108.08.00.nix
index 24daa366b2af..d3e32105f7df 100644
--- a/pkgs/development/ocaml-modules/typeconv/108.08.00.nix
+++ b/pkgs/development/ocaml-modules/type_conv/108.08.00.nix
@@ -7,7 +7,7 @@ in
 assert stdenv.lib.versionOlder "3.12" ocaml_version;
 
 stdenv.mkDerivation {
-  name = "ocaml-typeconv-108.08.00";
+  name = "ocaml-type_conv-108.08.00";
 
   src = fetchurl {
     url = https://ocaml.janestreet.com/ocaml-core/108.08.00/individual/type_conv-108.08.00.tar.gz;
diff --git a/pkgs/development/ocaml-modules/typeconv/109.60.01.nix b/pkgs/development/ocaml-modules/type_conv/109.60.01.nix
similarity index 95%
rename from pkgs/development/ocaml-modules/typeconv/109.60.01.nix
rename to pkgs/development/ocaml-modules/type_conv/109.60.01.nix
index 359f906ce347..fe42dd5ddcbd 100644
--- a/pkgs/development/ocaml-modules/typeconv/109.60.01.nix
+++ b/pkgs/development/ocaml-modules/type_conv/109.60.01.nix
@@ -7,7 +7,7 @@ in
 assert stdenv.lib.versionOlder "4.00" ocaml_version;
 
 stdenv.mkDerivation {
-  name = "ocaml-typeconv-109.60.01";
+  name = "ocaml-type_conv-109.60.01";
 
   src = fetchurl {
     url = https://github.com/janestreet/type_conv/archive/109.60.01.tar.gz;
diff --git a/pkgs/development/ocaml-modules/typeconv/112.01.01.nix b/pkgs/development/ocaml-modules/type_conv/112.01.01.nix
similarity index 96%
rename from pkgs/development/ocaml-modules/typeconv/112.01.01.nix
rename to pkgs/development/ocaml-modules/type_conv/112.01.01.nix
index fd7ebc28b977..e65306d15018 100644
--- a/pkgs/development/ocaml-modules/typeconv/112.01.01.nix
+++ b/pkgs/development/ocaml-modules/type_conv/112.01.01.nix
@@ -3,7 +3,7 @@
 buildOcaml rec {
   minimumSupportedOcamlVersion = "4.02";
 
-  name = "typeconv";
+  name = "type_conv";
   version = "112.01.01";
 
   src = fetchurl {
diff --git a/pkgs/development/tools/ocaml/oasis/default.nix b/pkgs/development/tools/ocaml/oasis/default.nix
index 29507f49c186..e823466f4174 100644
--- a/pkgs/development/tools/ocaml/oasis/default.nix
+++ b/pkgs/development/tools/ocaml/oasis/default.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, ocaml, findlib, ocaml_data_notation, ocaml_typeconv, camlp4,
+{stdenv, fetchurl, ocaml, findlib, ocaml_data_notation, type_conv, camlp4,
  ocamlmod, ocamlify, ounit, expect}:
 
 stdenv.mkDerivation {
@@ -13,7 +13,7 @@ stdenv.mkDerivation {
 
   buildInputs =
     [
-      ocaml findlib ocaml_typeconv ocamlmod ocamlify ounit camlp4
+      ocaml findlib type_conv ocamlmod ocamlify ounit camlp4
     ];
 
   propagatedBuildInputs = [ ocaml_data_notation ];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index ef55701f917f..87bb768d4e68 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4133,9 +4133,7 @@ let
 
     eliom = callPackage ../development/ocaml-modules/eliom { };
 
-    enumerate = callPackage ../development/ocaml-modules/enumerate {
-      type_conv = ocaml_typeconv;
-    };
+    enumerate = callPackage ../development/ocaml-modules/enumerate { };
 
     erm_xml = callPackage ../development/ocaml-modules/erm_xml { };
 
@@ -4293,21 +4291,20 @@ let
       camlp5 = camlp5_transitional;
     };
 
-    typeconv_108_08_00 = callPackage ../development/ocaml-modules/typeconv/108.08.00.nix { };
-    typeconv_109_60_01 = callPackage ../development/ocaml-modules/typeconv/109.60.01.nix { };
-    typeconv_112_01_01 = callPackage ../development/ocaml-modules/typeconv/112.01.01.nix { };
-    ocaml_typeconv =
+    type_conv_108_08_00 = callPackage ../development/ocaml-modules/type_conv/108.08.00.nix { };
+    type_conv_109_60_01 = callPackage ../development/ocaml-modules/type_conv/109.60.01.nix { };
+    type_conv_112_01_01 = callPackage ../development/ocaml-modules/type_conv/112.01.01.nix { };
+    type_conv =
       if lib.versionOlder "4.02" ocaml_version
-      then typeconv_112_01_01
+      then type_conv_112_01_01
       else if lib.versionOlder "4.00" ocaml_version
-      then typeconv_109_60_01
+      then type_conv_109_60_01
       else if lib.versionOlder "3.12" ocaml_version
-      then typeconv_108_08_00
+      then type_conv_108_08_00
       else null;
 
-    sexplib_108_08_00 = callPackage ../development/ocaml-modules/sexplib/108.08.00.nix {
-      typeconv = typeconv_108_08_00;
-    };
+    sexplib_108_08_00 = callPackage ../development/ocaml-modules/sexplib/108.08.00.nix { };
+
     ocaml_sexplib =
       if lib.versionOlder "4.00" ocaml_version
       then callPackage ../development/ocaml-modules/sexplib { }