diff --git a/pkgs/development/ocaml-modules/sedlex/default.nix b/pkgs/development/ocaml-modules/sedlex/default.nix
deleted file mode 100644
index 685d4426cfc3..000000000000
--- a/pkgs/development/ocaml-modules/sedlex/default.nix
+++ /dev/null
@@ -1,37 +0,0 @@
-{ stdenv, lib, fetchFromGitHub, ocaml, findlib, gen, ppx_tools_versioned, ocaml-migrate-parsetree }:
-
-if lib.versionOlder ocaml.version "4.02"
-then throw "sedlex is not available for OCaml ${ocaml.version}"
-else
-
-stdenv.mkDerivation rec {
-  pname = "ocaml${ocaml.version}-sedlex";
-  version = "1.99.5";
-
-  src = fetchFromGitHub {
-    owner = "ocaml-community";
-    repo = "sedlex";
-    rev = "fb84e1766fc4b29e79ec40029ffee5cdb37b392f";
-    sha256 = "sha256-VhzlDTYBFXgKWT69PqZYLuHkiaDwzhmyX2XfaqzHFl4=";
-  };
-
-  nativeBuildInputs = [ ocaml findlib ];
-
-  propagatedBuildInputs = [ gen ocaml-migrate-parsetree ppx_tools_versioned ];
-
-  strictDeps = true;
-
-  buildFlags = [ "all" "opt" ];
-
-  createFindlibDestdir = true;
-
-  dontStrip = true;
-
-  meta = {
-    homepage = "https://github.com/ocaml-community/sedlex";
-    description = "An OCaml lexer generator for Unicode";
-    license = lib.licenses.mit;
-    inherit (ocaml.meta) platforms;
-    maintainers = [ lib.maintainers.vbgl ];
-  };
-}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 905294b8f8b5..ef3d6abc9ea1 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1320,8 +1320,6 @@ let
 
     safepass = callPackage ../development/ocaml-modules/safepass { };
 
-    sedlex = callPackage ../development/ocaml-modules/sedlex { };
-
     sedlex_2 = callPackage ../development/ocaml-modules/sedlex/2.nix { };
 
     semaphore-compat = callPackage ../development/ocaml-modules/semaphore-compat { };