diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
index e40a2c0a9543..b0b05a96c2f0 100644
--- a/drivers/staging/comedi/drivers/ni_mio_common.c
+++ b/drivers/staging/comedi/drivers/ni_mio_common.c
@@ -4294,7 +4294,7 @@ static int pack_ad8842(int addr, int val, int *bitstring)
 struct caldac_struct {
 	int n_chans;
 	int n_bits;
-	int (*packbits)(int, int, int *);
+	int (*packbits)(int address, int value, int *bitstring);
 };
 
 static struct caldac_struct caldacs[] = {