diff --git a/pkgs/development/ocaml-modules/ocsigen-server/default.nix b/pkgs/development/ocaml-modules/ocsigen-server/default.nix
index 081f9edbecf9..efbb12304970 100644
--- a/pkgs/development/ocaml-modules/ocsigen-server/default.nix
+++ b/pkgs/development/ocaml-modules/ocsigen-server/default.nix
@@ -1,7 +1,7 @@
-{ stdenv, fetchurl, ocaml, findlib, which, react, ssl,
-lwt, ocamlnet, ocaml_pcre, cryptokit, tyxml, ipaddr, zlib,
+{ stdenv, fetchurl, ocaml, findlib, which, react, ssl
+, ocamlnet, ocaml_pcre, cryptokit, tyxml, ipaddr, zlib,
 libev, openssl, ocaml_sqlite3, tree, uutf, makeWrapper, camlp4
-, camlzip, pgocaml
+, camlzip, pgocaml, lwt2, lwt_react, lwt_ssl
 }:
 
 let mkpath = p: n:
@@ -9,17 +9,32 @@ let mkpath = p: n:
   "${p}/lib/ocaml/${v}/site-lib/${n}";
 in
 
+let param =
+  if stdenv.lib.versionAtLeast ocaml.version "4.03" then {
+    version = "2.9";
+    sha256 = "0na3qa4h89f2wv31li63nfpg4151d0g8fply0bq59j3bhpyc85nd";
+    buildInputs = [ lwt_react lwt_ssl ];
+    ldpath = "";
+  } else {
+    version = "2.8";
+    sha256 = "1v44qv2ixd7i1qinyhlzzqiffawsdl7xhhh6ysd7lf93kh46d5sy";
+    buildInputs = [ lwt2 ];
+    ldpath = "${mkpath lwt2 "lwt"}";
+  }
+; in
+
 stdenv.mkDerivation {
-  name = "ocsigenserver-2.8";
+  name = "ocsigenserver-${param.version}";
 
   src = fetchurl {
-    url = https://github.com/ocsigen/ocsigenserver/archive/2.8.tar.gz;
-    sha256 = "1v44qv2ixd7i1qinyhlzzqiffawsdl7xhhh6ysd7lf93kh46d5sy";
+    url = "https://github.com/ocsigen/ocsigenserver/archive/${param.version}.tar.gz";
+    inherit (param) sha256;
   };
 
-  buildInputs = [ocaml which findlib react ssl lwt
+  buildInputs = [ocaml which findlib react ssl
   ocamlnet ocaml_pcre cryptokit tyxml ipaddr zlib libev openssl
-  ocaml_sqlite3 tree uutf makeWrapper camlp4 pgocaml camlzip ];
+  ocaml_sqlite3 tree uutf makeWrapper camlp4 pgocaml camlzip ]
+  ++ (param.buildInputs or []);
 
   configureFlags = "--root $(out) --prefix /";
 
@@ -31,7 +46,7 @@ stdenv.mkDerivation {
   ''
   rm -rf $out/var/run
   wrapProgram $out/bin/ocsigenserver \
-    --prefix CAML_LD_LIBRARY_PATH : "${mkpath ssl "ssl"}:${mkpath lwt "lwt"}:${mkpath ocamlnet "netsys"}:${mkpath ocamlnet "netstring"}:${mkpath ocaml_pcre "pcre"}:${mkpath cryptokit "cryptokit"}:${mkpath ocaml_sqlite3 "sqlite3"}"
+    --prefix CAML_LD_LIBRARY_PATH : "${mkpath ssl "ssl"}:${param.ldpath}:${mkpath ocamlnet "netsys"}:${mkpath ocamlnet "netstring"}:${mkpath ocaml_pcre "pcre"}:${mkpath cryptokit "cryptokit"}:${mkpath ocaml_sqlite3 "sqlite3"}"
   '';
 
   dontPatchShebangs = true;
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 741a58ce588a..22efb8a8a353 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -504,7 +504,7 @@ let
 
     ocplib-simplex = callPackage ../development/ocaml-modules/ocplib-simplex { };
 
-    ocsigen_server = callPackage ../development/ocaml-modules/ocsigen-server { lwt = lwt2; };
+    ocsigen_server = callPackage ../development/ocaml-modules/ocsigen-server { };
 
     ocsigen-start = callPackage ../development/ocaml-modules/ocsigen-start { };