diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index f8c30d3e76..d36bd2eda3 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -1385,6 +1385,10 @@
   ## Include/Protocol/MmCommunication.h
   gEfiMmCommunicationProtocolGuid  = { 0xc68ed8e2, 0x9dc6, 0x4cbd, { 0x9d, 0x94, 0xdb, 0x65, 0xac, 0xc5, 0xc3, 0x32 }}
 
+  ## This protocol is a MM protocol published by a standalone MM Foundation code if MM Foundation is loaded in PEI phase.
+  ## This protocol should be installed immediately after DXE IPL installs EFI_PEI_END_OF_PEI_PHASE_PPI
+  gEfiMmEndOfPeiProtocol           = { 0xf33e1bf3, 0x980b, 0x4bfb, { 0xa2, 0x9a, 0xb2, 0x9c, 0x86, 0x45, 0x37, 0x32 }}
+
   #
   # Protocols defined in PI 1.6.
   #