diff --git a/pkgs/development/ocaml-modules/kafka/default.nix b/pkgs/development/ocaml-modules/kafka/default.nix
index 595381ca2873..9c0698878a58 100644
--- a/pkgs/development/ocaml-modules/kafka/default.nix
+++ b/pkgs/development/ocaml-modules/kafka/default.nix
@@ -10,24 +10,25 @@
 lib.throwIf (lib.versionAtLeast ocaml.version "5.0")
   "kafka is not available for OCaml ${ocaml.version}"
 
-buildDunePackage rec {
-  pname = "kafka";
-  version = "0.5";
+  buildDunePackage
+  rec {
+    pname = "kafka";
+    version = "0.5";
 
-  src = fetchurl {
-    url = "https://github.com/didier-wenzek/ocaml-kafka/releases/download/${version}/kafka-${version}.tbz";
-    sha256 = "0m9212yap0a00hd0f61i4y4fna3141p77qj3mm7jl1h4q60jdhvy";
-  };
+    src = fetchurl {
+      url = "https://github.com/didier-wenzek/ocaml-kafka/releases/download/${version}/kafka-${version}.tbz";
+      sha256 = "0m9212yap0a00hd0f61i4y4fna3141p77qj3mm7jl1h4q60jdhvy";
+    };
 
-  propagatedBuildInputs = [
-    rdkafka
-    zlib
-  ];
+    propagatedBuildInputs = [
+      rdkafka
+      zlib
+    ];
 
-  meta = with lib; {
-    homepage = "https://github.com/didier-wenzek/ocaml-kafka";
-    description = "OCaml bindings for Kafka";
-    license = licenses.mit;
-    maintainers = [ maintainers.vbgl ];
-  };
-}
+    meta = with lib; {
+      homepage = "https://github.com/didier-wenzek/ocaml-kafka";
+      description = "OCaml bindings for Kafka";
+      license = licenses.mit;
+      maintainers = [ maintainers.vbgl ];
+    };
+  }