diff --git a/drivers/tty/isicom.c b/drivers/tty/isicom.c
index 59ed783c4bcda1e34a559193a857a6a41332c6ff..2054427992e0baac5553b7cd6c09a25ee2e6f9be 100644
--- a/drivers/tty/isicom.c
+++ b/drivers/tty/isicom.c
@@ -1055,7 +1055,7 @@ static int isicom_send_break(struct tty_struct *tty, int length)
 
 	outw(0x8000 | ((port->channel) << (card->shift_count)) | 0x3, base);
 	outw((length & 0xff) << 8 | 0x00, base);
-	outw((length & 0xff00), base);
+	outw((length & 0xff00u), base);
 	InterruptTheCard(base);
 
 	unlock_card(card);