diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
index c9d18548783a480054b050f18d92e16724d62da8..30e9e60bc5cdd8b85c7d8278dec91ad7e2e5beb4 100644
--- a/drivers/tty/serial/men_z135_uart.c
+++ b/drivers/tty/serial/men_z135_uart.c
@@ -308,9 +308,6 @@ static void men_z135_handle_tx(struct men_z135_port *uart)
 	if (port->x_char)
 		goto out;
 
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(port);
-
 	/* calculate bytes to copy */
 	qlen = uart_circ_chars_pending(xmit);
 	if (qlen <= 0)
@@ -357,6 +354,9 @@ static void men_z135_handle_tx(struct men_z135_port *uart)
 
 	port->icount.tx += n;
 
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
 irq_en:
 	if (!uart_circ_empty(xmit))
 		men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);