diff --git a/os/common/startup/ARMCAx-TZ/devices/SAMA5D2/sama5d2x.h b/os/common/startup/ARMCAx-TZ/devices/SAMA5D2/sama5d2x.h
index 363ae23ab..18e627821 100644
--- a/os/common/startup/ARMCAx-TZ/devices/SAMA5D2/sama5d2x.h
+++ b/os/common/startup/ARMCAx-TZ/devices/SAMA5D2/sama5d2x.h
@@ -155,12 +155,12 @@
 #define ID_SYSC         (74) /**< \brief System Controller Interrupt, RTC, RSTC, PMC (SYSC) */
 #define ID_ACC          (75) /**< \brief Analog Comparator (ACC) */
 #define ID_RXLP         (76) /**< \brief Uart Low Power (RXLP) */
+#define ID_SFRBU        (77) /**< \brief Special Function Register Backup (SFRBU) */
 #define ID_CHIPID       (78) /**< \brief Chip ID (CHIPID) */
 
 #define ID_PERIPH_COUNT (79) /**< \brief Number of peripheral IDs */
 
 /* XDMA Peripheral Interface Number */
-
 #define PERID_TWIHS0_TX    0
 #define PERID_TWIHS0_RX    1
 #define PERID_TWIHS1_TX    2
@@ -307,6 +307,7 @@
 #define ID_SYSC_MSK           (1 << (ID_SYSC & 0x1F))
 #define ID_ACC_MSK            (1 << (ID_ACC & 0x1F))
 #define ID_RXLP_MSK           (1 << (ID_RXLP & 0x1F))
+#define ID_SFRBU_MSK          (1 << (ID_SFRBU & 0x1F))
 #define ID_CHIPID_MSK         (1 << (ID_CHIPID & 0x1F))
 
 /* MASTER MATRIX ID DEFINITION FOR SAMA5D2x */