diff --git a/src/tunnel.h b/src/tunnel.h
index 08d368bc..616778b4 100644
--- a/src/tunnel.h
+++ b/src/tunnel.h
@@ -29,6 +29,10 @@
 #include <ev.h>
 #endif
 
+#ifdef __MINGW32__
+#include "winsock.h"
+#endif
+
 #include "crypto.h"
 #include "jconf.h"
 
@@ -72,6 +76,10 @@ typedef struct remote_ctx {
 
 typedef struct remote {
     int fd;
+#ifdef TCP_FASTOPEN_WINSOCK
+    OVERLAPPED olap;
+    int connect_ex_done;
+#endif
     buffer_t *buf;
     struct remote_ctx *recv_ctx;
     struct remote_ctx *send_ctx;