diff --git a/extra/unix/types/types.factor b/extra/unix/types/types.factor
index ed2dbd5ba8..983d5d677d 100644
--- a/extra/unix/types/types.factor
+++ b/extra/unix/types/types.factor
@@ -12,5 +12,6 @@ os
     { "freebsd" [ "unix.types.freebsd" require ] }
     { "openbsd" [ "unix.types.openbsd" require ] }
     { "netbsd"  [ "unix.types.netbsd"  require ] }
+    { "winnt" [ ] }
   }
 case