diff --git a/StandaloneMmPkg/StandaloneMmPkg.dec b/StandaloneMmPkg/StandaloneMmPkg.dec
index a23a0f8f2f..25e660b247 100644
--- a/StandaloneMmPkg/StandaloneMmPkg.dec
+++ b/StandaloneMmPkg/StandaloneMmPkg.dec
@@ -3,6 +3,7 @@
 # required by Standalone MM platform.
 #
 # Copyright (c) 2016-2021, Arm Ltd. All rights reserved.<BR>
+# Copyright (c) 2024, Intel Corporation. All rights reserved.<BR>
 #
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -51,6 +52,8 @@
   gEfiStandaloneMmNonSecureBufferGuid      = { 0xf00497e3, 0xbfa2, 0x41a1, { 0x9d, 0x29, 0x54, 0xc2, 0xe9, 0x37, 0x21, 0xc5 }}
   gEfiMmCpuDriverEpDescriptorGuid          = { 0x6ecbd5a1, 0xc0f8, 0x4702, { 0x83, 0x01, 0x4f, 0xc2, 0xc5, 0x47, 0x0a, 0x51 }}
 
+  gEventMmDispatchGuid                     = { 0x7e6efffa, 0x69b4, 0x4c1b, { 0xa4, 0xc7, 0xaf, 0xf9, 0xc9, 0x24, 0x4f, 0xee }}
+
 [PcdsFixedAtBuild, PcdsPatchableInModule]
   ## Maximum permitted encapsulation levels of sections in a firmware volume,
   #  in the MM phase. Minimum value is 1. Sections nested more deeply are rejected.