diff --git a/drivers/serial/serial_cs.c b/drivers/serial/serial_cs.c
index 0ee7239c5d694aa3c5b05f1c05e246d975e11c35..df854401af2d1eaaa2e8c9f35bea6836bcda0c0a 100644
--- a/drivers/serial/serial_cs.c
+++ b/drivers/serial/serial_cs.c
@@ -146,7 +146,8 @@ static void quirk_wakeup_oxsemi(struct pcmcia_device *link)
 {
 	struct serial_info *info = link->priv;
 
-	outb(12, info->c950ctrl + 1);
+	if (info->c950ctrl)
+		outb(12, info->c950ctrl + 1);
 }
 
 /* request_region? oxsemi branch does no request_region too... */