diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 12e8ceffab65..93b3922bb5b6 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1650,7 +1650,7 @@ static int pci_fintek_rs485_config(struct uart_port *port, struct ktermios *term
 }
 
 static const struct serial_rs485 pci_fintek_rs485_supported = {
-	.flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND,
+	.flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND,
 	/* F81504/508/512 does not support RTS delay before or after send */
 };