diff --git a/pkgs/development/ocaml-modules/functory/default.nix b/pkgs/development/ocaml-modules/functory/default.nix
index 6d4deac38c47..c8b29759b97c 100644
--- a/pkgs/development/ocaml-modules/functory/default.nix
+++ b/pkgs/development/ocaml-modules/functory/default.nix
@@ -1,14 +1,24 @@
-{stdenv, fetchurl, ocaml, findlib}:
+{ stdenv, fetchurl, ocaml, findlib }:
 
 assert stdenv.lib.versionAtLeast (stdenv.lib.getVersion ocaml) "3.11";
 
+let param =
+  if stdenv.lib.versionAtLeast ocaml.version "4.02" then {
+    version = "0.6";
+    sha256 = "18wpyxblz9jh5bfp0hpffnd0q8cq1b0dqp0f36vhqydfknlnpx8y";
+  } else {
+    version = "0.5";
+    sha256 = "1j17rhifdjv1z262dma148ywg34x0zjn8vczdrnkwajsm4qg1hw3";
+  };
+in
+
 stdenv.mkDerivation {
 
-  name = "ocaml-functory-0.5";
+  name = "ocaml${ocaml.version}-functory-${param.version}";
 
   src = fetchurl {
-    url = https://www.lri.fr/~filliatr/functory/download/functory-0.5.tar.gz;
-    sha256 = "1j17rhifdjv1z262dma148ywg34x0zjn8vczdrnkwajsm4qg1hw3";
+    url = "https://www.lri.fr/~filliatr/functory/download/functory-${param.version}.tar.gz";
+    inherit (param) sha256;
   };
 
   buildInputs = [ ocaml findlib ];