diff --git a/misc/winsock.c b/misc/winsock.c
index 23acb22c924..b7d016b7452 100644
--- a/misc/winsock.c
+++ b/misc/winsock.c
@@ -36,6 +36,7 @@
 #include <sys/wait.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#include <netinet/tcp.h>
 #include <arpa/inet.h>
 #include <ctype.h>
 #include <fcntl.h>