diff --git a/MdePkg/Include/IndustryStandard/Sal.h b/MdePkg/Include/IndustryStandard/Sal.h
index 7b111e02c3..cdc547a4e6 100644
--- a/MdePkg/Include/IndustryStandard/Sal.h
+++ b/MdePkg/Include/IndustryStandard/Sal.h
@@ -324,6 +324,7 @@ typedef struct {
   UINT8   Type;
   UINT8   Reserved[5];
   UINT64  FwVendorId;
+  UINT8   Reserved2[40];
 } SAL_UPDATE_PAL_DATA_BLOCK;
 ///
 /// Data structure pointed by parameter param_buf.