diff --git a/drivers/staging/comedi/drivers/ni_stc.h b/drivers/staging/comedi/drivers/ni_stc.h
index 368d46831c13..0a613c077608 100644
--- a/drivers/staging/comedi/drivers/ni_stc.h
+++ b/drivers/staging/comedi/drivers/ni_stc.h
@@ -1421,8 +1421,6 @@ struct ni_board_struct {
 	enum caldac_enum caldac[3];
 };
 
-#define n_ni_boards  (sizeof(ni_boards)/sizeof(struct ni_board_struct))
-
 #define MAX_N_AO_CHAN 8
 #define NUM_GPCT 2