diff --git a/drivers/staging/comedi/drivers/ni_65xx.c b/drivers/staging/comedi/drivers/ni_65xx.c
index 747f7700875b..9d824c59123a 100644
--- a/drivers/staging/comedi/drivers/ni_65xx.c
+++ b/drivers/staging/comedi/drivers/ni_65xx.c
@@ -242,8 +242,6 @@ static const struct ni_65xx_board ni_65xx_boards[] = {
 	 },
 };
 
-#define n_ni_65xx_boards ARRAY_SIZE(ni_65xx_boards)
-
 static inline unsigned ni_65xx_port_by_channel(unsigned channel)
 {
 	return channel / ni_65xx_channels_per_port;