diff --git a/pkgs/development/ocaml-modules/colors/default.nix b/pkgs/development/ocaml-modules/colors/default.nix
index 765af72b9d2d..c368c6ea3af3 100644
--- a/pkgs/development/ocaml-modules/colors/default.nix
+++ b/pkgs/development/ocaml-modules/colors/default.nix
@@ -6,14 +6,14 @@
   mdx,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "colors";
   version = "0.0.1";
 
   minimalOCamlVersion = "4.13";
 
   src = fetchurl {
-    url = "https://github.com/leostera/colors/releases/download/${version}/colors-${version}.tbz";
+    url = "https://github.com/leostera/colors/releases/download/${finalAttrs.version}/colors-${finalAttrs.version}.tbz";
     hash = "sha256-fY1j9FODVnifwsI8qkKm0QSmssgWqYFXJ7y8o7/KmEY=";
   };
 
@@ -30,8 +30,8 @@ buildDunePackage rec {
   meta = {
     description = "Pure OCaml library for manipulating colors across color spaces";
     homepage = "https://github.com/leostera/colors";
-    changelog = "https://github.com/leostera/colors/blob/${version}/CHANGES.md";
+    changelog = "https://github.com/leostera/colors/blob/${finalAttrs.version}/CHANGES.md";
     license = lib.licenses.mit;
     maintainers = [ ];
   };
-}
+})