diff --git a/drivers/net/mctp/mctp-serial.c b/drivers/net/mctp/mctp-serial.c
index 7a40d07ff77bb..f39bbe255497d 100644
--- a/drivers/net/mctp/mctp-serial.c
+++ b/drivers/net/mctp/mctp-serial.c
@@ -91,8 +91,8 @@ static int next_chunk_len(struct mctp_serial *dev)
 	 * will be those non-escaped bytes, and does not include the escaped
 	 * byte.
 	 */
-	for (i = 1; i + dev->txpos + 1 < dev->txlen; i++) {
-		if (needs_escape(dev->txbuf[dev->txpos + i + 1]))
+	for (i = 1; i + dev->txpos < dev->txlen; i++) {
+		if (needs_escape(dev->txbuf[dev->txpos + i]))
 			break;
 	}