diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index 8b69de32a6..d9c2c32475 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -154,6 +154,7 @@
   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