diff --git a/MdePkg/Include/Uefi/UefiSpec.h b/MdePkg/Include/Uefi/UefiSpec.h
index da3d2fb264..199ee37a59 100644
--- a/MdePkg/Include/Uefi/UefiSpec.h
+++ b/MdePkg/Include/Uefi/UefiSpec.h
@@ -1716,6 +1716,8 @@ EFI_STATUS
 //
 #define EFI_SYSTEM_TABLE_SIGNATURE      SIGNATURE_64 ('I','B','I',' ','S','Y','S','T')
 #define EFI_SYSTEM_TABLE_REVISION       ((2 << 16) | (10))
+#define EFI_2_30_SYSTEM_TABLE_REVISION  ((2 << 16) | (30))
+#define EFI_2_20_SYSTEM_TABLE_REVISION  ((2 << 16) | (20))
 #define EFI_2_10_SYSTEM_TABLE_REVISION  ((2 << 16) | (10))
 #define EFI_2_00_SYSTEM_TABLE_REVISION  ((2 << 16) | (00))
 #define EFI_1_10_SYSTEM_TABLE_REVISION  ((1 << 16) | (10))