diff --git a/pkgs/development/ocaml-modules/ocaml-gettext/default.nix b/pkgs/development/ocaml-modules/ocaml-gettext/default.nix
index 547fa77ae6e9..ba571b32084e 100644
--- a/pkgs/development/ocaml-modules/ocaml-gettext/default.nix
+++ b/pkgs/development/ocaml-modules/ocaml-gettext/default.nix
@@ -1,21 +1,23 @@
-{ lib, fetchurl, buildDunePackage, gettext, fileutils, ounit }:
+{ lib, fetchurl, buildDunePackage, cppo, gettext, fileutils, ounit }:
 
 buildDunePackage rec {
   pname = "gettext";
-  version = "0.4.1";
+  version = "0.4.2";
 
   minimumOCamlVersion = "4.03";
 
   src = fetchurl {
     url = "https://github.com/gildor478/ocaml-gettext/releases/download/v${version}/gettext-v${version}.tbz";
-    sha256 = "0pwy6ym5fd77mdbgyas8x86vbrri9cgk79g8wxdjplhyi7zhh158";
+    sha256 = "19ynsldb21r539fiwz1f43apsdnx7hj2a2d9qr9wg2hva9y2qrwb";
   };
 
+  buildInputs = [ cppo ];
+
   propagatedBuildInputs = [ gettext fileutils ];
 
   doCheck = true;
 
-  checkInputs = lib.optional doCheck ounit;
+  checkInputs = [ ounit ];
 
   dontStrip = true;