diff --git a/pkgs/development/ocaml-modules/async/default.nix b/pkgs/development/ocaml-modules/async/default.nix
deleted file mode 100644
index 230db8189de..00000000000
--- a/pkgs/development/ocaml-modules/async/default.nix
+++ /dev/null
@@ -1,23 +0,0 @@
-{stdenv, buildOcaml, fetchurl, async_kernel_p4,
- async_unix_p4, async_extra_p4, pa_ounit}:
-
-buildOcaml rec {
-  name = "async";
-  version = "112.24.00";
-
-  minimumSupportedOcamlVersion = "4.02";
-
-  src = fetchurl {
-    url = "https://github.com/janestreet/async/archive/${version}.tar.gz";
-    sha256 = "ecc4ca939ab098e689332921b110dbaacd06d9f8d8bf697023dfff3ca37dc1e9";
-  };
-
-  propagatedBuildInputs = [ async_kernel_p4 async_unix_p4 async_extra_p4 pa_ounit ];
-
-  meta = with stdenv.lib; {
-    homepage = "https://github.com/janestreet/async";
-    description = "Jane Street Capital's asynchronous execution library";
-    license = licenses.asl20;
-    maintainers = [ maintainers.ericbmerritt ];
-  };
-}
diff --git a/pkgs/development/ocaml-modules/janestreet/async.nix b/pkgs/development/ocaml-modules/janestreet/async.nix
deleted file mode 100644
index 8f15531403a..00000000000
--- a/pkgs/development/ocaml-modules/janestreet/async.nix
+++ /dev/null
@@ -1,16 +0,0 @@
-{stdenv, buildOcamlJane, async_kernel,
- async_unix, async_extra}:
-
-buildOcamlJane {
-  name = "async";
-  version = "113.33.03";
-  hash = "0wyspkp8k833fh03r3h016nbfn6kjfhvb2bg42cly6agcak59fmr";
-  propagatedBuildInputs = [ async_kernel async_unix async_extra ];
-
-  meta = with stdenv.lib; {
-    homepage = "https://github.com/janestreet/async";
-    description = "Jane Street Capital's asynchronous execution library";
-    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 44b90219606..aadd51e6294 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -42,11 +42,6 @@ let
 
     async_unix_p4 = callPackage ../development/ocaml-modules/async_unix { };
 
-    async_p4 =
-      if lib.versionOlder "4.02" ocaml.version
-      then callPackage ../development/ocaml-modules/async { }
-      else null;
-
     atd = callPackage ../development/ocaml-modules/atd { };
 
     atdgen = callPackage ../development/ocaml-modules/atdgen { };
@@ -1213,13 +1208,6 @@ let
       then callPackage ../development/ocaml-modules/janestreet/async-extra.nix {}
       else async_extra_p4;
 
-    async =
-      if lib.versionOlder "4.03" ocaml.version
-      then janeStreet.async
-      else if lib.versionOlder "4.02" ocaml.version
-      then callPackage ../development/ocaml-modules/janestreet/async.nix {}
-      else async_p4;
-
     # Apps / from all-packages
 
     ocamlnat = callPackage  ../development/ocaml-modules/ocamlnat { };