diff --git a/pkgs/development/ocaml-modules/uuidm/default.nix b/pkgs/development/ocaml-modules/uuidm/default.nix
index bece082f6418..949737d28ee0 100644
--- a/pkgs/development/ocaml-modules/uuidm/default.nix
+++ b/pkgs/development/ocaml-modules/uuidm/default.nix
@@ -11,6 +11,10 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-/GZbkJVDQu1UY8SliK282kUWAVMfOnpQadUlRT/tJrM=";
   };
 
+  postPatch = ''
+    substituteInPlace pkg/META --replace "bytes" ""
+  '';
+
   strictDeps = true;
 
   nativeBuildInputs = [ ocaml findlib ocamlbuild topkg ];