diff --git a/pkgs/development/ocaml-modules/pp_loc/default.nix b/pkgs/development/ocaml-modules/pp_loc/default.nix
index e6cd85d7cf89..757301803f2c 100644
--- a/pkgs/development/ocaml-modules/pp_loc/default.nix
+++ b/pkgs/development/ocaml-modules/pp_loc/default.nix
@@ -4,14 +4,14 @@
   buildDunePackage,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "pp_loc";
   version = "2.1.0";
 
   minimalOCamlVersion = "4.08";
 
   src = fetchurl {
-    url = "https://github.com/Armael/pp_loc/releases/download/v${version}/pp_loc-${version}.tbz";
+    url = "https://github.com/Armael/pp_loc/releases/download/v${finalAttrs.version}/pp_loc-${finalAttrs.version}.tbz";
     hash = "sha256-L3NlBdQx6BpP6FGtMQ/ynsTNIMj9N+8FDZ5vEFC6p8s=";
   };
 
@@ -23,4 +23,4 @@ buildDunePackage rec {
     maintainers = [ lib.maintainers.vbgl ];
     homepage = "https://armael.github.io/pp_loc/pp_loc/";
   };
-}
+})