Index: /trunk/src/VBox/Devices/Network/slirp/libslirp.h
===================================================================
--- /trunk/src/VBox/Devices/Network/slirp/libslirp.h	(revision 54110)
+++ /trunk/src/VBox/Devices/Network/slirp/libslirp.h	(revision 54111)
@@ -101,5 +101,5 @@
  * Main API has primitives for listening DNS change event since 4.3.
  */
-#if (defined(RT_OS_DARWIN))
+#if defined(RT_OS_DARWIN) || defined(RT_OS_WINDOWS)
 # define HAVE_NOTIFICATION_FOR_DNS_UPDATE 1
 #else