diff --git a/util/superiotool/nuvoton.c b/util/superiotool/nuvoton.c
index d2b72f2634..ffd12be165 100644
--- a/util/superiotool/nuvoton.c
+++ b/util/superiotool/nuvoton.c
@@ -538,13 +538,13 @@ static const struct superio_registers reg_table[] = {
 			{0x00,0x00,0x00,0x00,0x08,0x09,0x32,0x00,EOT}},
 		{0x07, "GPIO 6, GPIO 7, GPIO 8",
 			{0x30,0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xec,0xed,0xf4,0xf5,0xf6,0xf7,0xf8,EOT},
-			{0x00,0x7f,0x00,0x00,0x00,0xff,0x00,0x00,0x00,0x00,0x00,0xff,0x00,0x00,0x00,0x00,EOT}},
+			{0x00,0x7f,NANA,0x00,NANA,0xff,NANA,0x00,NANA,0x00,0x00,0xff,NANA,0x00,NANA,0x00,EOT}},
 		{0x08, "WDT1, WDT_MEM, GPIO 0, GPIO 1",
 			{0x30,0x60,0x61,0xe0,0xe1,0xe2,0xe3,0xe4,0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfe,0xff,EOT},
-			{0x00,0x00,0x00,0xff,0x00,0x00,0x00,0x00,0xff,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,EOT}},
+			{0x00,0x00,0x00,0xff,NANA,0x00,NANA,0x00,0xff,NANA,0x00,NANA,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,EOT}},
 		{0x09, "GPIO 2, GPIO 3, GPIO 4, GPIO 5",
 			{0x30,0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xee,0xf0,0xf1,0xf2,0xf4,0xf5,0xf6,0xf7,0xfe,EOT},
-			{0x00,0xff,0x00,0x00,0x00,0x7f,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0x00,0x00,0xff,0x00,0x00,0x00,0x00,EOT}},
+			{0x00,0xff,NANA,0x00,NANA,0x7f,NANA,0x00,NANA,NANA,0x00,0x00,0x00,0x00,0xff,NANA,0x00,0xff,NANA,0x00,NANA,0x00,EOT}},
 		{0x0a, "ACPI",
 			{0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe9,0xec,0xed,0xee,0xf0,0xf2,0xf3,0xf4,0xf6,0xf7,0xfc,0xfe,EOT},
 			{0x01,0x00,0x00,0x00,0x00,0x02,0x1a,0x00,0x00,0x00,0x00,0x00,0x10,0x5c,0x00,0x00,0x00,0xc0,0x00,0x00,EOT}},