diff --git a/pkgs/development/ocaml-modules/parse-argv/default.nix b/pkgs/development/ocaml-modules/parse-argv/default.nix
index b59feac4fb40..2af0427210a4 100644
--- a/pkgs/development/ocaml-modules/parse-argv/default.nix
+++ b/pkgs/development/ocaml-modules/parse-argv/default.nix
@@ -7,14 +7,14 @@
   ounit,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "parse-argv";
   version = "0.2.0";
 
   minimalOCamlVersion = "4.03";
 
   src = fetchurl {
-    url = "https://github.com/mirage/parse-argv/releases/download/v${version}/parse-argv-v${version}.tbz";
+    url = "https://github.com/mirage/parse-argv/releases/download/v${finalAttrs.version}/parse-argv-v${finalAttrs.version}.tbz";
     sha256 = "06dl04fcmwpkydzni2fzwrhk0bqypd55mgxfax9v82x65xrgj5gw";
   };
 
@@ -29,4 +29,4 @@ buildDunePackage rec {
     license = lib.licenses.isc;
     maintainers = [ lib.maintainers.vbgl ];
   };
-}
+})