diff --git a/pkgs/development/ocaml-modules/ppx_tools/default.nix b/pkgs/development/ocaml-modules/ppx_tools/default.nix
index ddc3dec898dc..5672300ddabe 100644
--- a/pkgs/development/ocaml-modules/ppx_tools/default.nix
+++ b/pkgs/development/ocaml-modules/ppx_tools/default.nix
@@ -1,17 +1,20 @@
 { stdenv, fetchFromGitHub, ocaml, findlib }:
 
 let param = {
-  "4.02.3" = {
+  "4.02" = {
     version = "5.0+4.02.0";
     sha256 = "16drjk0qafjls8blng69qiv35a84wlafpk16grrg2i3x19p8dlj8"; };
-  "4.03.0" = {
+  "4.03" = {
     version = "5.0+4.03.0";
     sha256 = "061v1fl5z7z3ywi4ppryrlcywnvnqbsw83ppq72qmkc7ma4603jg"; };
-  "4.04.0" = {
+  "4.04" = {
     version = "unstable-20161114";
     rev = "49c08e2e4ea8fef88692cd1dcc1b38a9133f17ac";
     sha256 = "0ywzfkf5brj33nwh49k9if8x8v433ral25f3nbklfc9vqr06zrfl"; };
-}."${ocaml.version}";
+  "4.05" = {
+    version = "5.0+4.05.0";
+    sha256 = "1jvvhk6wnkvm7b9zph309ihsc0hyxfpahmxxrq19vx8c674jsdm4"; };
+}."${ocaml.meta.branch}";
 in
   stdenv.mkDerivation {
     name = "ocaml${ocaml.version}-ppx_tools-${param.version}";