diff --git a/gio/gsocks4aproxy.c b/gio/gsocks4aproxy.c
index 3dad118eb..b3146d08f 100644
--- a/gio/gsocks4aproxy.c
+++ b/gio/gsocks4aproxy.c
@@ -79,9 +79,9 @@ g_socks4a_proxy_init (GSocks4aProxy *proxy)
  * +----+----+----+----+----+----+----+----+----+----+....+----+------+....+------+
  * | VN | CD | DSTPORT |      DSTIP        | USERID       |NULL| HOST |    | NULL |
  * +----+----+----+----+----+----+----+----+----+----+....+----+------+....+------+
- *    1    1      2              4           variable       1    variable
+ *    1    1      2              4           variable       1    variable    1
  */
-#define SOCKS4_CONN_MSG_LEN	    (9 + SOCKS4_MAX_LEN * 2)
+#define SOCKS4_CONN_MSG_LEN	    (10 + SOCKS4_MAX_LEN * 2)
 static gint
 set_connect_msg (guint8      *msg,
 		 const gchar *hostname,