diff --git a/pkgs/development/ocaml-modules/curly/default.nix b/pkgs/development/ocaml-modules/curly/default.nix
index cffaf7514b13..dac26094ec70 100644
--- a/pkgs/development/ocaml-modules/curly/default.nix
+++ b/pkgs/development/ocaml-modules/curly/default.nix
@@ -11,7 +11,7 @@
   cacert,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "curly";
   version = "0.3.0";
 
@@ -20,7 +20,7 @@ buildDunePackage rec {
   duneVersion = "3";
 
   src = fetchurl {
-    url = "https://github.com/rgrinberg/curly/releases/download/${version}/curly-${version}.tbz";
+    url = "https://github.com/rgrinberg/curly/releases/download/${finalAttrs.version}/curly-${finalAttrs.version}.tbz";
     hash = "sha256-Qn/PKBNOcMt3dk2f7uJD8x0yo4RHobXSjTQck7fcXTw=";
   };
 
@@ -52,4 +52,4 @@ buildDunePackage rec {
     license = lib.licenses.isc;
     maintainers = [ lib.maintainers.sternenseemann ];
   };
-}
+})