diff --git a/pkgs/development/ocaml-modules/sedlex/default.nix b/pkgs/development/ocaml-modules/sedlex/default.nix
new file mode 100644
index 000000000000..5dbc74ef5436
--- /dev/null
+++ b/pkgs/development/ocaml-modules/sedlex/default.nix
@@ -0,0 +1,29 @@
+{ stdenv, fetchzip, ocaml, findlib, gen, ppx_tools }:
+
+assert stdenv.lib.versionAtLeast ocaml.version "4.02";
+
+stdenv.mkDerivation rec {
+  name = "ocaml${ocaml.version}-${version}";
+  version = "1.99.3";
+
+  src = fetchzip {
+    url = "http://github.com/alainfrisch/sedlex/archive/v${version}.tar.gz";
+    sha256 = "1wghjy3qyj43ll1ikchlqy7fv2hxcn3ap9xgsscm2ch09d8dcv7y";
+  };
+
+  buildInputs = [ ocaml findlib ppx_tools ];
+
+  propagatedBuildInputs = [ gen ];
+
+  buildFlags = [ "all" "opt" ];
+
+  createFindlibDestdir = true;
+
+  meta = {
+    homepage = https://github.com/alainfrisch/sedlex;
+    description = "An OCaml lexer generator for Unicode";
+    license = stdenv.lib.licenses.mit;
+    inherit (ocaml.meta) platforms;
+    maintainers = [ stdenv.lib.maintainers.vbgl ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index d4ca17f6dbd8..b86ac44bd652 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -429,6 +429,8 @@ let
 
     safepass = callPackage ../development/ocaml-modules/safepass { };
 
+    sedlex = callPackage ../development/ocaml-modules/sedlex { };
+
     sqlite3EZ = callPackage ../development/ocaml-modules/sqlite3EZ { };
 
     stringext = callPackage ../development/ocaml-modules/stringext { };