diff --git a/pkgs/development/ocaml-modules/rio/default.nix b/pkgs/development/ocaml-modules/rio/default.nix
index e705007d570e..fa0dc3388311 100644
--- a/pkgs/development/ocaml-modules/rio/default.nix
+++ b/pkgs/development/ocaml-modules/rio/default.nix
@@ -5,14 +5,14 @@
   cstruct,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "rio";
   version = "0.0.8";
 
   minimalOCamlVersion = "5.1";
 
   src = fetchurl {
-    url = "https://github.com/leostera/riot/releases/download/${version}/riot-${version}.tbz";
+    url = "https://github.com/leostera/riot/releases/download/${finalAttrs.version}/riot-${finalAttrs.version}.tbz";
     hash = "sha256-SsiDz53b9bMIT9Q3IwDdB3WKy98WSd9fiieU41qZpeE=";
   };
 
@@ -23,8 +23,8 @@ buildDunePackage rec {
   meta = {
     description = "Ergonomic, composable, efficient read/write streams";
     homepage = "https://github.com/leostera/riot";
-    changelog = "https://github.com/leostera/riot/blob/${version}/CHANGES.md";
+    changelog = "https://github.com/leostera/riot/blob/${finalAttrs.version}/CHANGES.md";
     license = lib.licenses.mit;
     maintainers = [ ];
   };
-}
+})