diff --git a/src/socket.c b/src/socket.c
index 142562de2..e28d7cd5d 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -5,6 +5,8 @@
 */
 
 #ifdef _WIN32
+  #define _WIN32_WINNT 0x0501
+  
   #include <winsock2.h>
   #include <ws2tcpip.h>
   #include <windows.h>