diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index a159cb293981..862001d09aa8 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -190,8 +190,10 @@ struct netconsole_target {
 	bool			extended;
 	bool			release;
 	struct netpoll		np;
-	/* protected by target_list_lock */
-	char			buf[MAX_PRINT_CHUNK];
+	/* protected by target_list_lock; +1 gives scnprintf() room for its
+	 * NUL terminator so a full MAX_PRINT_CHUNK payload is not truncated
+	 */
+	char			buf[MAX_PRINT_CHUNK + 1];
 	struct work_struct	resume_wq;
 };
 
@@ -1938,7 +1940,7 @@ static void send_msg_no_fragmentation(struct netconsole_target *nt,
 	if (release_len) {
 		release = init_utsname()->release;
 
-		scnprintf(nt->buf, MAX_PRINT_CHUNK, "%s,%.*s", release,
+		scnprintf(nt->buf, sizeof(nt->buf), "%s,%.*s", release,
 			  msg_len, msg);
 		msg_len += release_len;
 	} else {
@@ -1947,12 +1949,12 @@ static void send_msg_no_fragmentation(struct netconsole_target *nt,
 
 	if (userdata)
 		msg_len += scnprintf(&nt->buf[msg_len],
-				     MAX_PRINT_CHUNK - msg_len, "%s",
+				     sizeof(nt->buf) - msg_len, "%s",
 				     userdata);
 
 	if (sysdata)
 		msg_len += scnprintf(&nt->buf[msg_len],
-				     MAX_PRINT_CHUNK - msg_len, "%s",
+				     sizeof(nt->buf) - msg_len, "%s",
 				     sysdata);
 
 	send_udp(nt, nt->buf, msg_len);