diff --git a/pkgs/development/ocaml-modules/core_extended/default.nix b/pkgs/development/ocaml-modules/core_extended/default.nix
deleted file mode 100644
index b657e812fdf35..0000000000000
--- a/pkgs/development/ocaml-modules/core_extended/default.nix
+++ /dev/null
@@ -1,33 +0,0 @@
-{stdenv, buildOcaml, fetchurl, bin_prot_p4, comparelib, core_p4, custom_printf,
- fieldslib_p4, pa_bench, pa_ounit, pipebang, pa_test, textutils_p4, re2_p4, sexplib_p4}:
-
-buildOcaml rec {
-  name = "core_extended";
-  version = "112.24.00";
-
-  minimumSupportedOcamlVersion = "4.02";
-
-  src = fetchurl {
-    url = "https://github.com/janestreet/core_extended/archive/${version}.tar.gz";
-    sha256 = "f87b0661b6c2cfb545ec61d1cb2ab1b9c4967b6ac14e651de41d3a6fb7f0f1e3";
-  };
-
-  preConfigure = stdenv.lib.optionalString stdenv.isLinux ''
-    patch lib/extended_unix_stubs.c <<EOF
-    0a1
-    > #define _LINUX_QUOTA_VERSION 2
-    EOF
-  '';
-
-  hasSharedObjects = true;
-  buildInputs = [ pa_bench pa_test pa_ounit ];
-  propagatedBuildInputs = [bin_prot_p4 comparelib core_p4 custom_printf fieldslib_p4
-                           pipebang textutils_p4 re2_p4 sexplib_p4 ];
-
-  meta = with stdenv.lib; {
-    homepage = "https://github.com/janestreet/core_extended";
-    description = "Jane Street Capital's standard library overlay";
-    license = licenses.asl20;
-    maintainers = [ maintainers.ericbmerritt ];
-  };
-}
diff --git a/pkgs/development/ocaml-modules/janestreet/core-extended.nix b/pkgs/development/ocaml-modules/janestreet/core-extended.nix
deleted file mode 100644
index 19550a82327a4..0000000000000
--- a/pkgs/development/ocaml-modules/janestreet/core-extended.nix
+++ /dev/null
@@ -1,28 +0,0 @@
-{stdenv, buildOcamlJane,
- core,
- bin_prot, fieldslib, sexplib, typerep, variantslib,
- ppx_assert, ppx_bench, ppx_driver, ppx_expect, ppx_inline_test, ppx_jane,
- re2, textutils}:
-
-buildOcamlJane {
-  name = "core_extended";
-  hash = "1j4ipcn741j8w3h4gpv5sygjzg6b5g6gc2jcrr4n0jyn5dq8b0p5";
-  propagatedBuildInputs =
-    [ core bin_prot fieldslib sexplib typerep variantslib
-      ppx_assert ppx_bench ppx_driver ppx_expect ppx_inline_test ppx_jane
-      re2 textutils ];
-
-  patchPhase = stdenv.lib.optionalString stdenv.isLinux ''
-    patch src/extended_unix_stubs.c <<EOF
-0a1
-> #define _LINUX_QUOTA_VERSION 2
-EOF
-  '';
-
-  meta = with stdenv.lib; {
-    homepage = "https://github.com/janestreet/core_extended";
-    description = "Jane Street Capital's standard library overlay";
-    license = licenses.asl20;
-    maintainers = [ maintainers.maurer maintainers.ericbmerritt ];
-  };
-}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index dd92168e4087a..9517769f7b38f 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -593,8 +593,6 @@ let
 
     comparelib = callPackage ../development/ocaml-modules/comparelib { };
 
-    core_extended_p4 = callPackage ../development/ocaml-modules/core_extended { };
-
     core_kernel_p4 = callPackage ../development/ocaml-modules/core_kernel { };
 
     core_p4 = callPackage ../development/ocaml-modules/core { };
@@ -1194,13 +1192,6 @@ let
       then callPackage ../development/ocaml-modules/janestreet/textutils.nix {}
       else textutils_p4;
 
-    core_extended =
-      if lib.versionOlder "4.03" ocaml.version
-      then janeStreet.core_extended
-      else if lib.versionOlder "4.02" ocaml.version
-      then callPackage ../development/ocaml-modules/janestreet/core-extended.nix {}
-      else core_extended_p4;
-
     async_kernel =
       if lib.versionOlder "4.03" ocaml.version
       then janeStreet.async_kernel