diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 593bff357a..403a66a5ad 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -431,6 +431,9 @@
   ## Include/Ppi/SdMmcHostController.h
   gEdkiiPeiSdMmcHostControllerPpiGuid = { 0xb30dfeed, 0x947f, 0x4396, { 0xb1, 0x5a, 0xdf, 0xbd, 0xb9, 0x16, 0xdc, 0x24 }}
 
+  ## Include/Ppi/IoMmu.h
+  gEdkiiIoMmuPpiGuid = { 0x70b0af26, 0xf847, 0x4bb6, { 0xaa, 0xb9, 0xcd, 0xe8, 0x4f, 0xc6, 0x14, 0x31 } }
+
 [Protocols]
   ## Load File protocol provides capability to load and unload EFI image into memory and execute it.
   #  Include/Protocol/LoadPe32Image.h