diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 524921360ca7..39f92eb1e698 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -686,13 +686,10 @@ static void sc16is7xx_handle_tx(struct uart_port *port)
 		}
 		to_send = (to_send > txlen) ? txlen : to_send;
 
-		/* Add data to send */
-		port->icount.tx += to_send;
-
 		/* Convert to linear buffer */
 		for (i = 0; i < to_send; ++i) {
 			s->buf[i] = xmit->buf[xmit->tail];
-			xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+			uart_xmit_advance(port, 1);
 		}
 
 		sc16is7xx_fifo_write(port, to_send);