diff --git a/pkgs/by-name/xb/xbill/package.nix b/pkgs/by-name/xb/xbill/package.nix
index fb2f4906bcb9..0663503c3162 100644
--- a/pkgs/by-name/xb/xbill/package.nix
+++ b/pkgs/by-name/xb/xbill/package.nix
@@ -82,5 +82,6 @@ stdenv.mkDerivation rec {
       operating system.
     '';
     mainProgram = "xbill";
+    platforms = lib.platforms.unix;
   };
 }