diff --git a/MdePkg/Include/Protocol/FirmwareVolumeBlock.h b/MdePkg/Include/Protocol/FirmwareVolumeBlock.h
index 325f927adc..b059edf4b3 100644
--- a/MdePkg/Include/Protocol/FirmwareVolumeBlock.h
+++ b/MdePkg/Include/Protocol/FirmwareVolumeBlock.h
@@ -20,7 +20,7 @@
 
 
 #define EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL_GUID \
-  { 0xDE28BC59, 0x6228, 0x41BD, 0xBD, {0xF6, 0xA3, 0xB9, 0xAD,0xB5, 0x8D, 0xA1 } }
+  { 0xDE28BC59, 0x6228, 0x41BD, {0xBD, 0xF6, 0xA3, 0xB9, 0xAD,0xB5, 0x8D, 0xA1 } }
 
 
 typedef struct _EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL;