diff --git a/drivers/comedi/drivers/dt2811.c b/drivers/comedi/drivers/dt2811.c
index 0438b8c90e44..5af2c71de4a2 100644
--- a/drivers/comedi/drivers/dt2811.c
+++ b/drivers/comedi/drivers/dt2811.c
@@ -567,7 +567,7 @@ static int dt2811_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	dt2811_reset(dev);
 
 	/* IRQ's 2,3,5,7 are valid for async command support */
-	if (it->options[1] <= 7  && (BIT(it->options[1]) & 0xac)) {
+	if (it->options[1]>= 0 && it->options[1] <= 7  && (BIT(it->options[1]) & 0xac)) {
 		ret = request_irq(it->options[1], dt2811_interrupt, 0,
 				  dev->board_name, dev);
 		if (ret == 0)