diff --git a/drivers/staging/comedi/drivers/usbduxfast.c b/drivers/staging/comedi/drivers/usbduxfast.c
index 9f6a0e930d94cd685b1980aa15888d594540c53f..31993e02e5d946e633912b84b393522b3ef82abb 100644
--- a/drivers/staging/comedi/drivers/usbduxfast.c
+++ b/drivers/staging/comedi/drivers/usbduxfast.c
@@ -115,16 +115,6 @@
  */
 #define NUMOFINBUFFERSHIGH	10
 
-/*
- * total number of usbduxfast devices
- */
-#define NUMUSBDUXFAST	16
-
-/*
- * analogue in subdevice
- */
-#define SUBDEV_AD	0
-
 /*
  * min delay steps for more than one channel
  * basically when the mux gives up ;-)
@@ -1295,7 +1285,7 @@ static int usbduxfast_attach_common(struct comedi_device *dev)
 	}
 
 	/* Analog Input subdevice */
-	s = &dev->subdevices[SUBDEV_AD];
+	s = &dev->subdevices[0];
 	dev->read_subdev = s;
 	s->type		= COMEDI_SUBD_AI;
 	s->subdev_flags	= SDF_READABLE | SDF_GROUND | SDF_CMD_READ;