diff --git a/pkgs/development/ocaml-modules/async_unix/default.nix b/pkgs/development/ocaml-modules/async_unix/default.nix
deleted file mode 100644
index 13dfbcf37901..000000000000
--- a/pkgs/development/ocaml-modules/async_unix/default.nix
+++ /dev/null
@@ -1,27 +0,0 @@
-{stdenv, buildOcaml, fetchurl, async_kernel_p4,
- bin_prot_p4, comparelib, core_p4, fieldslib_p4, herelib, pa_ounit,
- pipebang, pa_test, sexplib_p4}:
-
-buildOcaml rec {
-  name = "async_unix";
-  version = "112.24.00";
-
-  minimumSupportedOcamlVersion = "4.02";
-
-  src = fetchurl {
-    url = "https://github.com/janestreet/async_unix/archive/${version}.tar.gz";
-    sha256 = "d490b1dc42f0987a131fa9695b55f215ad90cdaffbfac35b7f9f88f3834337ab";
-  };
-
-  hasSharedObjects = true;
-  buildInputs = [ pa_ounit ];
-  propagatedBuildInputs = [ async_kernel_p4 core_p4 bin_prot_p4 comparelib
-                            fieldslib_p4 herelib pipebang pa_test sexplib_p4 ];
-
-   meta = with stdenv.lib; {
-    homepage = "https://github.com/janestreet/async_unix";
-    description = "Jane Street Capital's asynchronous execution library (unix)";
-    license = licenses.asl20;
-    maintainers = [ maintainers.ericbmerritt ];
-   };
-}
diff --git a/pkgs/development/ocaml-modules/janestreet/async-unix.nix b/pkgs/development/ocaml-modules/janestreet/async-unix.nix
deleted file mode 100644
index 5678d95a131e..000000000000
--- a/pkgs/development/ocaml-modules/janestreet/async-unix.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-{stdenv, buildOcamlJane, async_kernel,
- bin_prot, comparelib, core, fieldslib, herelib,
- pipebang, sexplib}:
-
-buildOcamlJane {
-  name = "async_unix";
-  hash = "03ng7f0s22wwzspakiqj442vs1a7yf834109jcj9r3g1awwfhcy7";
-  propagatedBuildInputs = [ async_kernel core bin_prot comparelib
-                            fieldslib herelib pipebang sexplib ];
-
-  meta = with stdenv.lib; {
-   homepage = "https://github.com/janestreet/async_unix";
-   description = "Jane Street Capital's asynchronous execution library (unix)";
-   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 afb87b8cdb3b..76082efda8f5 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -38,8 +38,6 @@ let
 
     async_kernel_p4 = callPackage ../development/ocaml-modules/async_kernel { };
 
-    async_unix_p4 = callPackage ../development/ocaml-modules/async_unix { };
-
     atd = callPackage ../development/ocaml-modules/atd { };
 
     atdgen = callPackage ../development/ocaml-modules/atdgen { };
@@ -1182,13 +1180,6 @@ let
       then janeStreet.async_rpc_kernel
       else callPackage ../development/ocaml-modules/janestreet/async-rpc-kernel.nix {};
 
-    async_unix =
-      if lib.versionOlder "4.03" ocaml.version
-      then janeStreet.async_unix
-      else if lib.versionOlder "4.02" ocaml.version
-      then callPackage ../development/ocaml-modules/janestreet/async-unix.nix {}
-      else async_unix_p4;
-
     # Apps / from all-packages
 
     ocamlnat = callPackage  ../development/ocaml-modules/ocamlnat { };