diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index d2692d4..3fc89da 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -2193,7 +2193,7 @@
 	port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
 	port->icount.tx += (cnt - port->xmit_cnt);
 
-	if (port->xmit_cnt < WAKEUP_CHARS && tty)
+	if (port->xmit_cnt < WAKEUP_CHARS)
 		tty_wakeup(tty);
 
 	if (port->xmit_cnt <= 0) {