diff --git a/lib/plat/lws-plat-unix.c b/lib/plat/lws-plat-unix.c
index bacc6af64..351e4b9b6 100644
--- a/lib/plat/lws-plat-unix.c
+++ b/lib/plat/lws-plat-unix.c
@@ -1,7 +1,7 @@
 /*
  * libwebsockets - small server side websockets and web server implementation
  *
- * Copyright (C) 2010-2017 Andy Green <andy@warmcat.com>
+ * Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
@@ -30,6 +30,10 @@
 #endif
 #include <dirent.h>
 
+#if defined(LWS_HAVE_TCP_USER_TIMEOUT) && defined(__linux__)
+#include <linux/tcp.h>
+#endif
+
 int
 lws_plat_socket_offset(void)
 {