diff --git a/pkgs/development/ocaml-modules/cstruct/1.9.0.nix b/pkgs/development/ocaml-modules/cstruct/1.9.0.nix
deleted file mode 100644
index 750a153c1c48..000000000000
--- a/pkgs/development/ocaml-modules/cstruct/1.9.0.nix
+++ /dev/null
@@ -1,36 +0,0 @@
-{ lib, stdenv, fetchFromGitHub, ocaml, ocamlbuild, ocplib-endian, sexplib, findlib, ppx_tools
-, async ? null, lwt ? null
-}:
-
-assert lib.versionAtLeast ocaml.version "4.01";
-
-let version = "1.9.0"; in
-
-let opt = b: "--${if b != null then "en" else "dis"}able"; in
-
-stdenv.mkDerivation {
-  name = "ocaml${ocaml.version}-cstruct-${version}";
-
-  src = fetchFromGitHub {
-    owner = "mirage";
-    repo = "ocaml-cstruct";
-    rev = "v${version}";
-    sha256 = "1c1j21zgmxi9spq23imy7byn50qr7hlds1cfpzxlsx9dp309jngy";
-  };
-
-  configureFlags = [ "${opt lwt}-lwt" "${opt async}-async" "${opt ppx_tools}-ppx" ];
-
-  buildInputs = [ ocaml findlib ocamlbuild ppx_tools lwt async ];
-  propagatedBuildInputs = [ ocplib-endian sexplib ];
-
-  createFindlibDestdir = true;
-  dontStrip = true;
-
-  meta = with lib; {
-    homepage = "https://github.com/mirage/ocaml-cstruct";
-    description = "Map OCaml arrays onto C-like structs";
-    license = lib.licenses.isc;
-    maintainers = [ maintainers.vbgl maintainers.ericbmerritt ];
-    platforms = ocaml.meta.platforms or [];
-  };
-}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index bdb16cba2a78..9168661a75b9 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -215,10 +215,7 @@ let
 
     csexp = callPackage ../development/ocaml-modules/csexp { };
 
-    cstruct =
-      if lib.versionAtLeast ocaml.version "4.2"
-      then callPackage ../development/ocaml-modules/cstruct {}
-      else callPackage ../development/ocaml-modules/cstruct/1.9.0.nix { };
+    cstruct = callPackage ../development/ocaml-modules/cstruct {};
 
     cstruct-lwt = callPackage ../development/ocaml-modules/cstruct/lwt.nix { };