diff --git a/pkgs/tools/text/html-tidy/default.nix b/pkgs/tools/text/html-tidy/default.nix
index 062715b8302..c0db454ed29 100644
--- a/pkgs/tools/text/html-tidy/default.nix
+++ b/pkgs/tools/text/html-tidy/default.nix
@@ -13,6 +13,9 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake libxslt/*manpage*/ ];
 
+  cmakeFlags = stdenv.lib.optional
+    (stdenv.cross.libc or null == "msvcrt") "-DCMAKE_SYSTEM_NAME=Windows";
+
   # ATM bin/tidy is statically linked, as upstream provides no other option yet.
   # https://github.com/htacg/tidy-html5/issues/326#issuecomment-160322107