diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index ea709c5aa1..406f22704a 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -107,6 +107,7 @@
   gPeiFlashMapPpiGuid            = { 0xf34c2fa0, 0xde88, 0x4270, {0x84, 0x14, 0x96, 0x12, 0x22, 0xf4, 0x52, 0x1c } }
 
   gPeiOperatorPresencePpiGuid    = { 0x20a7378c, 0xaa83, 0x4ce1, {0x82, 0x1f, 0x47, 0x40, 0xee, 0x1b, 0x3f, 0x9f } }
+  gPeiReadonlyVariableThunkPresentPpiGuid = { 0xe84e9e0b, 0xb5dd, 0x4d08, { 0x9e, 0x46, 0x82, 0x1f, 0xf, 0x14, 0xe9, 0x1b } } 
 
 [PcdsFeatureFlag.common]
   gEfiMdeModulePkgTokenSpaceGuid.PcdSupportUpdateCapsuleRest|FALSE|BOOLEAN|0x0001001d