diff --git a/pkgs/development/ocaml-modules/fileutils/default.nix b/pkgs/development/ocaml-modules/fileutils/default.nix
index 18d6c28ee223..fd71817929fe 100644
--- a/pkgs/development/ocaml-modules/fileutils/default.nix
+++ b/pkgs/development/ocaml-modules/fileutils/default.nix
@@ -8,12 +8,12 @@
   ounit2,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "fileutils";
   version = "0.6.6";
 
   src = fetchurl {
-    url = "https://github.com/gildor478/ocaml-fileutils/releases/download/v${version}/fileutils-${version}.tbz";
+    url = "https://github.com/gildor478/ocaml-fileutils/releases/download/v${finalAttrs.version}/fileutils-${finalAttrs.version}.tbz";
     hash = "sha256-eW1XkeK/ezv/IAz1BXp6GHhDnrzXTtDxCIz4Z1bVK+Y=";
   };
 
@@ -35,4 +35,4 @@ buildDunePackage rec {
     license = lib.licenses.lgpl21Plus;
     maintainers = with lib.maintainers; [ vbgl ];
   };
-}
+})