diff --git a/pkgs/development/ocaml-modules/syslog/default.nix b/pkgs/development/ocaml-modules/syslog/default.nix
index c97f1225663..9614c404c5b 100644
--- a/pkgs/development/ocaml-modules/syslog/default.nix
+++ b/pkgs/development/ocaml-modules/syslog/default.nix
@@ -13,7 +13,8 @@ stdenv.mkDerivation rec {
     sha256 = "1kqpc55ppzv9n555qgqpda49n7nvkqimzisyjx2a7338r7q4r5bw";
   };
 
-  buildInputs = [ ocaml findlib ];
+  nativeBuildInputs = [ ocaml findlib ];
+  strictDeps = true;
 
   buildFlags = [ "all" "opt" ];