diff --git a/pkgs/development/ocaml-modules/semaphore-compat/default.nix b/pkgs/development/ocaml-modules/semaphore-compat/default.nix
index 10d91afe8d27..cafa646e5b72 100644
--- a/pkgs/development/ocaml-modules/semaphore-compat/default.nix
+++ b/pkgs/development/ocaml-modules/semaphore-compat/default.nix
@@ -4,24 +4,22 @@
   fetchurl,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "semaphore-compat";
   version = "1.0.2";
 
   src = fetchurl {
-    url = "https://github.com/mirage/semaphore-compat/releases/download/${version}/semaphore-compat-${version}.tbz";
-    sha256 = "sha256-4CnZ2vX17IPpnlA7CNeuxZEKfA5HFoeQvwH0tCKNRnY=";
+    url = "https://github.com/mirage/semaphore-compat/releases/download/${finalAttrs.version}/semaphore-compat-${finalAttrs.version}.tbz";
+    hash = "sha256-4CnZ2vX17IPpnlA7CNeuxZEKfA5HFoeQvwH0tCKNRnY=";
   };
 
-  useDune2 = true;
-
-  meta = with lib; {
+  meta = {
     description = "Compatibility Semaphore module";
     homepage = "https://github.com/mirage/semaphore-compat";
-    license = with licenses; [
+    license = with lib.licenses; [
       lgpl21Plus
       ocamlLgplLinkingException
     ];
-    maintainers = [ maintainers.sternenseemann ];
+    maintainers = [ lib.maintainers.sternenseemann ];
   };
-}
+})