diff --git a/pkgs/os-specific/gnu/unionfs/default.nix b/pkgs/os-specific/gnu/unionfs/default.nix
index 5b42e7fdf2bb..f35fed282b68 100644
--- a/pkgs/os-specific/gnu/unionfs/default.nix
+++ b/pkgs/os-specific/gnu/unionfs/default.nix
@@ -20,7 +20,8 @@ stdenv.mkDerivation rec {
     '';
 
   makeFlags = [ "CC=i586-pc-gnu-gcc" ];
-  buildInputs = [ hurd machHeaders mig ];
+  buildInputs = [ hurd machHeaders ];
+  buildNativeInputs = [ mig ];
 
   installPhase =
     '' mkdir -p "$out/hurd"