diff --git a/drivers/comedi/drivers/addi_apci_3xxx.c b/drivers/comedi/drivers/addi_apci_3xxx.c
index 695cce103177..1dcda82d9503 100644
--- a/drivers/comedi/drivers/addi_apci_3xxx.c
+++ b/drivers/comedi/drivers/addi_apci_3xxx.c
@@ -787,7 +787,7 @@ static int apci3xxx_auto_attach(struct comedi_device *dev,
 			dev->irq = pcidev->irq;
 	}
 
-	n_subdevices = (board->ai_n_chan ? 0 : 1) + board->has_ao +
+	n_subdevices = (board->ai_n_chan ? 1 : 0) + board->has_ao +
 		       board->has_dig_in + board->has_dig_out +
 		       board->has_ttl_io;
 	ret = comedi_alloc_subdevices(dev, n_subdevices);