diff --git a/MdePkg/Include/Uefi/UefiSpec.h b/MdePkg/Include/Uefi/UefiSpec.h
index 8ffaf97515..b9282cc51b 100644
--- a/MdePkg/Include/Uefi/UefiSpec.h
+++ b/MdePkg/Include/Uefi/UefiSpec.h
@@ -1788,6 +1788,7 @@ EFI_STATUS
 // EFI Runtime Services Table
 //
 #define EFI_SYSTEM_TABLE_SIGNATURE      SIGNATURE_64 ('I','B','I',' ','S','Y','S','T')
+#define EFI_2_80_SYSTEM_TABLE_REVISION  ((2 << 16) | (80))
 #define EFI_2_70_SYSTEM_TABLE_REVISION  ((2 << 16) | (70))
 #define EFI_2_60_SYSTEM_TABLE_REVISION  ((2 << 16) | (60))
 #define EFI_2_50_SYSTEM_TABLE_REVISION  ((2 << 16) | (50))