diff --git a/drivers/comedi/drivers/pcmmio.c b/drivers/comedi/drivers/pcmmio.c
index f42b7343b4e4..afe2bda91659 100644
--- a/drivers/comedi/drivers/pcmmio.c
+++ b/drivers/comedi/drivers/pcmmio.c
@@ -684,7 +684,8 @@ static int pcmmio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 
 	pcmmio_reset(dev);
 
-	if (it->options[1]) {
+	/* the irq is configured in software, so any ISA irq is OK */
+	if (it->options[1] >= 1 && it->options[1] <= 15) {
 		ret = request_irq(it->options[1], interrupt_pcmmio, 0,
 				  dev->board_name, dev);
 		if (ret == 0) {