diff --git a/drivers/staging/comedi/drivers/rtd520.c b/drivers/staging/comedi/drivers/rtd520.c
index 0e3196f30734..d0b76a52bafb 100644
--- a/drivers/staging/comedi/drivers/rtd520.c
+++ b/drivers/staging/comedi/drivers/rtd520.c
@@ -407,8 +407,6 @@ struct rtdPrivate {
 /* Macros to access registers */
 
 /* Delay counter, 16bit */
-#define RtdDelayCount(dev) \
-	readl(devpriv->las0+LAS0_DCLK)
 #define RtdDelayCounter(dev, v) \
 	writel((v) & 0xffff, devpriv->las0+LAS0_DCLK)