diff --git a/MdePkg/Include/Uefi/UefiSpec.h b/MdePkg/Include/Uefi/UefiSpec.h
index f825f23e1c..e2e3b5e636 100644
--- a/MdePkg/Include/Uefi/UefiSpec.h
+++ b/MdePkg/Include/Uefi/UefiSpec.h
@@ -1769,6 +1769,7 @@ EFI_STATUS
 // EFI Runtime Services Table
 //
 #define EFI_SYSTEM_TABLE_SIGNATURE      SIGNATURE_64 ('I','B','I',' ','S','Y','S','T')
+#define EFI_2_50_SYSTEM_TABLE_REVISION  ((2 << 16) | (50))
 #define EFI_2_40_SYSTEM_TABLE_REVISION  ((2 << 16) | (40))
 #define EFI_2_31_SYSTEM_TABLE_REVISION  ((2 << 16) | (31))
 #define EFI_2_30_SYSTEM_TABLE_REVISION  ((2 << 16) | (30))
@@ -1777,7 +1778,7 @@ EFI_STATUS
 #define EFI_2_00_SYSTEM_TABLE_REVISION  ((2 << 16) | (00))
 #define EFI_1_10_SYSTEM_TABLE_REVISION  ((1 << 16) | (10))
 #define EFI_1_02_SYSTEM_TABLE_REVISION  ((1 << 16) | (02))
-#define EFI_SYSTEM_TABLE_REVISION       EFI_2_40_SYSTEM_TABLE_REVISION
+#define EFI_SYSTEM_TABLE_REVISION       EFI_2_50_SYSTEM_TABLE_REVISION
 #define EFI_SPECIFICATION_VERSION       EFI_SYSTEM_TABLE_REVISION
 
 #define EFI_RUNTIME_SERVICES_SIGNATURE  SIGNATURE_64 ('R','U','N','T','S','E','R','V')