diff --git a/drivers/staging/comedi/drivers/me4000.c b/drivers/staging/comedi/drivers/me4000.c
index 9a5c535451a1..5d268e45e725 100644
--- a/drivers/staging/comedi/drivers/me4000.c
+++ b/drivers/staging/comedi/drivers/me4000.c
@@ -617,7 +617,7 @@ static int me4000_ai_check_chanlist(struct comedi_device *dev,
 			return -EINVAL;
 		}
 
-		if (aref == SDF_DIFF) {
+		if (aref == AREF_DIFF) {
 			if (chan >= max_diff_chan) {
 				dev_dbg(dev->class_dev,
 					"Channel number to high\n");