2 files changed, 6 insertions, 3 deletions
diff --git a/nixpkgs/pkgs/development/ocaml-modules/kafka/default.nix b/nixpkgs/pkgs/development/ocaml-modules/kafka/default.nix
index 7636942033a9..28c380a4616d 100644
--- a/nixpkgs/pkgs/development/ocaml-modules/kafka/default.nix
+++ b/nixpkgs/pkgs/development/ocaml-modules/kafka/default.nix
@@ -5,8 +5,6 @@ buildDunePackage rec {
   pname = "kafka";
   version = "0.5";
 
-  useDune2 = true;
-
   src = fetchurl {
     url = "https://github.com/didier-wenzek/ocaml-kafka/releases/download/${version}/kafka-${version}.tbz";
     sha256 = "0m9212yap0a00hd0f61i4y4fna3141p77qj3mm7jl1h4q60jdhvy";
diff --git a/nixpkgs/pkgs/development/ocaml-modules/kafka/lwt.nix b/nixpkgs/pkgs/development/ocaml-modules/kafka/lwt.nix
index a6cef66b2761..da931d6e8bff 100644
--- a/nixpkgs/pkgs/development/ocaml-modules/kafka/lwt.nix
+++ b/nixpkgs/pkgs/development/ocaml-modules/kafka/lwt.nix
@@ -1,13 +1,18 @@
 { buildDunePackage
+, ocaml
+, lib
 , kafka
 , lwt
 , cmdliner
 }:
 
+lib.throwIf (lib.versionAtLeast ocaml.version "5.0")
+  "kafka_lwt is not available for OCaml ${ocaml.version}"
+
 buildDunePackage rec {
   pname = "kafka_lwt";
 
-  inherit (kafka) version useDune2 src;
+  inherit (kafka) version src;
 
   buildInputs = [ cmdliner ];