diff --git a/pkgs/development/ocaml-modules/callipyge/default.nix b/pkgs/development/ocaml-modules/callipyge/default.nix
index 40a3caaa61ce..d2037ab911f5 100644
--- a/pkgs/development/ocaml-modules/callipyge/default.nix
+++ b/pkgs/development/ocaml-modules/callipyge/default.nix
@@ -7,12 +7,12 @@
   fmt,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "callipyge";
   version = "0.2";
 
   src = fetchurl {
-    url = "https://github.com/oklm-wsh/Callipyge/releases/download/v${version}/${pname}-${version}.tbz";
+    url = "https://github.com/oklm-wsh/Callipyge/releases/download/v${finalAttrs.version}/callipyge-${finalAttrs.version}.tbz";
     hash = "sha256-T/94a88xvK51TggjXecdKc9kyTE9aIyueIt5T24sZB0=";
   };
 
@@ -34,4 +34,4 @@ buildDunePackage rec {
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ fufexan ];
   };
-}
+})