diff --git a/pkgs/development/ocaml-modules/rusage/default.nix b/pkgs/development/ocaml-modules/rusage/default.nix
index 8992d60368ca..14baa1f34aae 100644
--- a/pkgs/development/ocaml-modules/rusage/default.nix
+++ b/pkgs/development/ocaml-modules/rusage/default.nix
@@ -4,14 +4,14 @@
   buildDunePackage,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "rusage";
   version = "1.0.0";
 
   duneVersion = "3";
 
   src = fetchurl {
-    url = "https://github.com/CraigFe/ocaml-rusage/releases/download/${version}/rusage-${version}.tbz";
+    url = "https://github.com/CraigFe/ocaml-rusage/releases/download/${finalAttrs.version}/rusage-${finalAttrs.version}.tbz";
     hash = "sha256-OgYA2Fe1goqoaOS45Z6FBJNNYN/uq+KQoUwG8KSo6Fk=";
   };
 
@@ -21,4 +21,4 @@ buildDunePackage rec {
     license = lib.licenses.mit;
     maintainers = [ lib.maintainers.vbgl ];
   };
-}
+})