1 files changed, 2 insertions, 4 deletions
diff --git a/MdePkg/Library/PeiSmbusLib/InternalSmbusLib.h b/MdePkg/Library/PeiSmbusLib/InternalSmbusLib.h
index bd6d57f2d3..47c00a7306 100644
--- a/MdePkg/Library/PeiSmbusLib/InternalSmbusLib.h
+++ b/MdePkg/Library/PeiSmbusLib/InternalSmbusLib.h
@@ -11,8 +11,6 @@ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
 
 
-Module Name: SmbusLib.c
-
 **/
 
 #ifndef __INTERNAL_SMBUS_LIB_H
@@ -20,9 +18,9 @@ Module Name: SmbusLib.c
 
 #define SMBUS_LIB_SLAVE_ADDRESS(SmBusAddress)      (((SmBusAddress) >> 1)  & 0x7f)
 #define SMBUS_LIB_COMMAND(SmBusAddress)            (((SmBusAddress) >> 8)  & 0xff)
-#define SMBUS_LIB_LENGTH(SmBusAddress)             (((SmBusAddress) >> 16) & 0x1f)
+#define SMBUS_LIB_LENGTH(SmBusAddress)             (((SmBusAddress) >> 16) & 0x3f)
 #define SMBUS_LIB_PEC(SmBusAddress)     ((BOOLEAN) (((SmBusAddress) & SMBUS_LIB_PEC_BIT) != 0))
-#define SMBUS_LIB_RESEARVED(SmBusAddress)          ((SmBusAddress) & ~(((1 << 21) - 2) | SMBUS_LIB_PEC_BIT))
+#define SMBUS_LIB_RESEARVED(SmBusAddress)          ((SmBusAddress) & ~(((1 << 22) - 2) | SMBUS_LIB_PEC_BIT))
 
 //
 // Declaration for internal functions