diff --git a/pkgs/development/ocaml-modules/pprint/default.nix b/pkgs/development/ocaml-modules/pprint/default.nix
index 8e5a8109d652..0cdde114709c 100644
--- a/pkgs/development/ocaml-modules/pprint/default.nix
+++ b/pkgs/development/ocaml-modules/pprint/default.nix
@@ -13,8 +13,8 @@ let param =
 }; in
 
 stdenv.mkDerivation {
-  inherit (param) version;
-  pname = "ocaml${ocaml.version}-pprint";
+
+  name = "ocaml${ocaml.version}-pprint-${param.version}";
 
   src = fetchurl {
     url = "http://gallium.inria.fr/~fpottier/pprint/pprint-${param.version}.tar.gz";