diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index 2144979b59..870839e948 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -153,6 +153,7 @@
   MdePkg/Library/BaseS3SmbusLib/BaseS3SmbusLib.inf
   MdePkg/Library/BaseS3StallLib/BaseS3StallLib.inf
   MdePkg/Library/SmmMemLib/SmmMemLib.inf
+  MdePkg/Library/SmmIoLib/SmmIoLib.inf
   MdePkg/Library/BaseRngLib/BaseRngLib.inf
   MdePkg/Library/SmmPciExpressLib/SmmPciExpressLib.inf
   MdePkg/Library/SmiHandlerProfileLibNull/SmiHandlerProfileLibNull.inf