diff --git a/drivers/comedi/drivers/das16m1.c b/drivers/comedi/drivers/das16m1.c
index b8ea737ad3d1..1b638f5b5a4f 100644
--- a/drivers/comedi/drivers/das16m1.c
+++ b/drivers/comedi/drivers/das16m1.c
@@ -522,7 +522,8 @@ static int das16m1_attach(struct comedi_device *dev,
 	devpriv->extra_iobase = dev->iobase + DAS16M1_8255_IOBASE;
 
 	/* only irqs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, and 15 are valid */
-	if ((1 << it->options[1]) & 0xdcfc) {
+	if (it->options[1] >= 2 && it->options[1] <= 15 &&
+	    (1 << it->options[1]) & 0xdcfc) {
 		ret = request_irq(it->options[1], das16m1_interrupt, 0,
 				  dev->board_name, dev);
 		if (ret == 0)