diff --git a/include/enet/win32.h b/include/enet/win32.h
index 6fbd7c0..2d36061 100644
--- a/include/enet/win32.h
+++ b/include/enet/win32.h
@@ -18,6 +18,7 @@
 
 #include <stdlib.h>
 #include <winsock2.h>
+#include <ws2tcpip.h>
 
 typedef SOCKET ENetSocket;