diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 46a85c9..c2025f1 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -486,8 +486,7 @@
 	u32			  tw_ts_recent;
 	long			  tw_ts_recent_stamp;
 #ifdef CONFIG_TCP_MD5SIG
-	u16			  tw_md5_keylen;
-	u8			  tw_md5_key[TCP_MD5SIG_MAXKEYLEN];
+	struct tcp_md5sig_key	*tw_md5_key;
 #endif
 	/* Few sockets in timewait have cookies; in that case, then this
 	 * object holds a reference to them (tw_cookie_values->kref).