diff --git a/pkgs/development/ocaml-modules/menhir/default.nix b/pkgs/development/ocaml-modules/menhir/default.nix
index e7e29c73a6b1..b02015e6d567 100644
--- a/pkgs/development/ocaml-modules/menhir/default.nix
+++ b/pkgs/development/ocaml-modules/menhir/default.nix
@@ -1,11 +1,11 @@
 { stdenv, fetchurl, ocaml, findlib, ocamlbuild
-, version ? if stdenv.lib.versionAtLeast (stdenv.lib.getVersion ocaml) "4.02" then "20170101" else "20140422"
+, version ? if stdenv.lib.versionAtLeast (stdenv.lib.getVersion ocaml) "4.02" then "20170418" else "20140422"
 }@args:
 
 let
   sha256 =
   if version == "20140422" then "1ki1f2id6a14h9xpv2k8yb6px7dyw8cvwh39csyzj4qpzx7wia0d"
-  else if version == "20170101" then "0ika46i9gn3sjvspa62fb5dnr20k783vg5fj30649q0ialv6yscr"
+  else if version == "20170418" then "0avxkighxfr9x3vh2dkc5r1k2w7q2dz005w7syyzr7qjybpavpii"
   else throw ("menhir: unknown version " ++ version);
 in
 
diff --git a/pkgs/development/ocaml-modules/menhir/generic.nix b/pkgs/development/ocaml-modules/menhir/generic.nix
index 9d4615a006b5..d52da82d6d76 100644
--- a/pkgs/development/ocaml-modules/menhir/generic.nix
+++ b/pkgs/development/ocaml-modules/menhir/generic.nix
@@ -36,7 +36,7 @@ stdenv.mkDerivation {
       and Yann Régis-Gianas.
     '';
     license = with licenses; [
-      qpl /* generator */
+      (if versionAtLeast version "20170418" then gpl2 else qpl) /* generator */
       lgpl2 /* library */
     ];
     platforms = ocaml.meta.platforms or [];