diff --git a/drivers/staging/comedi/drivers/cb_pcidas.c b/drivers/staging/comedi/drivers/cb_pcidas.c
index 523378fbf302de1713d9420101ab9c6d2c5d04b3..26fc00e552a857fb9d2c3b34455d9d0e7036a5ff 100644
--- a/drivers/staging/comedi/drivers/cb_pcidas.c
+++ b/drivers/staging/comedi/drivers/cb_pcidas.c
@@ -1169,7 +1169,7 @@ static int cb_pcidas_ao_inttrig(struct comedi_device *dev,
 	struct comedi_cmd *cmd = &s->async->cmd;
 	unsigned long flags;
 
-	if (trig_num != 0)
+	if (trig_num != cmd->start_arg)
 		return -EINVAL;
 
 	/*  load up fifo */