diff --git a/ArmPkg/Include/IndustryStandard/ArmStdSmc.h b/ArmPkg/Include/IndustryStandard/ArmStdSmc.h
index 720a6021ba..593a3ce729 100644
--- a/ArmPkg/Include/IndustryStandard/ArmStdSmc.h
+++ b/ArmPkg/Include/IndustryStandard/ArmStdSmc.h
@@ -55,6 +55,8 @@
 #define ARM_SMC_ID_PSCI_AFFINITY_INFO_AARCH32  0x84000004
 #define ARM_SMC_ID_PSCI_MIGRATE_AARCH64        0xc4000005
 #define ARM_SMC_ID_PSCI_MIGRATE_AARCH32        0x84000005
+#define ARM_SMC_ID_PSCI_SYSTEM_OFF             0x84000008
+#define ARM_SMC_ID_PSCI_SYSTEM_RESET           0x84000009
 
 /* The current PSCI version is:  0.2 */
 #define ARM_SMC_PSCI_VERSION_MAJOR  0