diff --git a/pkgs/development/ocaml-modules/decoders-sexplib/default.nix b/pkgs/development/ocaml-modules/decoders-sexplib/default.nix
index 5b12b422fded..d2ca0652cfb3 100644
--- a/pkgs/development/ocaml-modules/decoders-sexplib/default.nix
+++ b/pkgs/development/ocaml-modules/decoders-sexplib/default.nix
@@ -8,7 +8,7 @@
   ounit2,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "decoders-sexplib";
 
   # sub-package built separately from the same source
@@ -31,8 +31,8 @@ buildDunePackage rec {
   meta = {
     description = "sexplib backend for decoders";
     homepage = "https://github.com/mattjbray/ocaml-decoders";
-    changelog = "https://github.com/mattjbray/ocaml-decoders/blob/${version}/CHANGES.md";
+    changelog = "https://github.com/mattjbray/ocaml-decoders/blob/${finalAttrs.version}/CHANGES.md";
     license = lib.licenses.isc;
     maintainers = with lib.maintainers; [ infinidoge ];
   };
-}
+})