1 files changed, 2 insertions, 3 deletions
diff --git a/pkgs/development/ocaml-modules/expat/default.nix b/pkgs/development/ocaml-modules/expat/default.nix
index b6ee0d192e33..0ecb135b4e8f 100644
--- a/pkgs/development/ocaml-modules/expat/default.nix
+++ b/pkgs/development/ocaml-modules/expat/default.nix
@@ -1,8 +1,6 @@
 {stdenv, fetchurl, ocaml, findlib, ounit, expat}:
 
 let
-  ocaml_version = (builtins.parseDrvName ocaml.name).version;
-  version = "0.9.1";
   pname = "ocaml-expat";
   testcase = fetchurl {
     url = "http://www.w3.org/TR/1998/REC-xml-19980210.xml";
@@ -11,8 +9,9 @@ let
 
 in
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "${pname}-${version}";
+  version = "0.9.1";
 
   src = fetchurl {
     url = "http://www.xs4all.nl/~mmzeeman/ocaml/${pname}-${version}.tar.gz";