diff --git a/pkgs/development/ocaml-modules/mirage-kv/default.nix b/pkgs/development/ocaml-modules/mirage-kv/default.nix
index cdcde9fee322..271dd924cf15 100644
--- a/pkgs/development/ocaml-modules/mirage-kv/default.nix
+++ b/pkgs/development/ocaml-modules/mirage-kv/default.nix
@@ -9,14 +9,14 @@
   alcotest,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "mirage-kv";
   version = "6.1.1";
 
   minimalOCamlVersion = "4.08";
 
   src = fetchurl {
-    url = "https://github.com/mirage/mirage-kv/releases/download/v${version}/mirage-kv-${version}.tbz";
+    url = "https://github.com/mirage/mirage-kv/releases/download/v${finalAttrs.version}/mirage-kv-${finalAttrs.version}.tbz";
     hash = "sha256-fNXNlaDpb5zUA2rTwi5h1j4v4LQmovxG+Am6u+1guPQ=";
   };
 
@@ -36,4 +36,4 @@ buildDunePackage rec {
     license = lib.licenses.isc;
     maintainers = [ lib.maintainers.vbgl ];
   };
-}
+})