diff --git a/vlib/os/os_win.v b/vlib/os/os_win.v
index 6918d9e6fa..d1899dfdfb 100644
--- a/vlib/os/os_win.v
+++ b/vlib/os/os_win.v
@@ -1,5 +1,8 @@
 module os
 
+#flag -lws2_32
+#include <winsock2.h>
+
 const (
 	PathSeparator = '\\' 
 )