diff --git a/pkgs/development/ocaml-modules/coin/default.nix b/pkgs/development/ocaml-modules/coin/default.nix
index 487c9f6c8c15..50b309d26f0e 100644
--- a/pkgs/development/ocaml-modules/coin/default.nix
+++ b/pkgs/development/ocaml-modules/coin/default.nix
@@ -7,13 +7,13 @@
   re,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "coin";
   version = "0.1.4";
   minimalOCamlVersion = "4.03";
 
   src = fetchurl {
-    url = "https://github.com/mirage/coin/releases/download/v${version}/coin-${version}.tbz";
+    url = "https://github.com/mirage/coin/releases/download/v${finalAttrs.version}/coin-${finalAttrs.version}.tbz";
     sha256 = "sha256:0069qqswd1ik5ay3d5q1v1pz0ql31kblfsnv0ax0z8jwvacp3ack";
   };
 
@@ -34,4 +34,4 @@ buildDunePackage rec {
     maintainers = [ ];
     mainProgram = "coin.generate";
   };
-}
+})