diff --git a/drivers/staging/comedi/drivers/dt282x.c b/drivers/staging/comedi/drivers/dt282x.c
index 2e1c615c8105..9527adf73ece 100644
--- a/drivers/staging/comedi/drivers/dt282x.c
+++ b/drivers/staging/comedi/drivers/dt282x.c
@@ -345,11 +345,6 @@ struct dt282x_private {
 	int dma_dir;
 };
 
-/*
- *    Some useless abstractions
- */
-#define chan_to_DAC(a)	((a)&1)
-
 static int prep_ai_dma(struct comedi_device *dev, int dma_index, int n)
 {
 	struct dt282x_private *devpriv = dev->private;