diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
index 7b566404cb33..31f739c7a08b 100644
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -223,8 +223,7 @@ static void mvebu_uart_start_tx(struct uart_port *port)
 
 	if (IS_EXTENDED(port) && !uart_circ_empty(xmit)) {
 		writel(xmit->buf[xmit->tail], port->membase + UART_TSH(port));
-		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
-		port->icount.tx++;
+		uart_xmit_advance(port, 1);
 	}
 
 	ctl = readl(port->membase + UART_INTR(port));