diff --git a/soc/arm/nuvoton_npcx/common/reg/reg_def.h b/soc/arm/nuvoton_npcx/common/reg/reg_def.h
index dc876320755..f9808f0df6f 100644
--- a/soc/arm/nuvoton_npcx/common/reg/reg_def.h
+++ b/soc/arm/nuvoton_npcx/common/reg/reg_def.h
@@ -671,8 +671,8 @@ struct espi_reg {
 #define NPCX_ESPICFG_HFLASHCHANEN        7
 #define NPCX_ESPICFG_CHANS_FIELD         FIELD(0, 4)
 #define NPCX_ESPICFG_HCHANS_FIELD        FIELD(4, 4)
-#define NPCX_ESPICFG_IOMODE_FIELD        FIELD(8, 9)
-#define NPCX_ESPICFG_MAXFREQ_FIELD       FIELD(10, 12)
+#define NPCX_ESPICFG_IOMODE_FIELD        FIELD(8, 2)
+#define NPCX_ESPICFG_MAXFREQ_FIELD       FIELD(10, 3)
 #define NPCX_ESPICFG_PCCHN_SUPP          24
 #define NPCX_ESPICFG_VWCHN_SUPP          25
 #define NPCX_ESPICFG_OOBCHN_SUPP         26