diff --git a/ArmPkg/ArmPkg.dec b/ArmPkg/ArmPkg.dec
index a8a22c649f..496f588bd0 100644
--- a/ArmPkg/ArmPkg.dec
+++ b/ArmPkg/ArmPkg.dec
@@ -2,7 +2,7 @@
 # ARM processor package.
 #
 # Copyright (c) 2009 - 2010, Apple Inc. All rights reserved.<BR>
-# Copyright (c) 2011 - 2018, ARM Limited. All rights reserved.
+# Copyright (c) 2011 - 2021, ARM Limited. All rights reserved.
 #
 #    SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -29,14 +29,20 @@
 [LibraryClasses.common]
   ArmLib|Include/Library/ArmLib.h
   ArmMmuLib|Include/Library/ArmMmuLib.h
-  SemihostLib|Include/Library/Semihosting.h
+  SemihostLib|Include/Library/SemihostLib.h
   DefaultExceptionHandlerLib|Include/Library/DefaultExceptionHandlerLib.h
   ArmDisassemblerLib|Include/Library/ArmDisassemblerLib.h
   ArmGicArchLib|Include/Library/ArmGicArchLib.h
-  ArmMtlLib|ArmPlatformPkg/Include/Library/ArmMtlLib.h
+  ArmMtlLib|Include/Library/ArmMtlLib.h
   ArmSvcLib|Include/Library/ArmSvcLib.h
   OpteeLib|Include/Library/OpteeLib.h
   StandaloneMmMmuLib|Include/Library/StandaloneMmMmuLib.h
+  ArmGenericTimerCounterLib|Include/Library/ArmGenericTimerCounterLib.h
+  ArmGicLib|Include/Library/ArmGicLib.h
+  ArmHvcLib|Include/Library/ArmHvcLib.h
+  OemMiscLib|Include/Library/OemMiscLib.h
+  ArmSmcLib|Include/Library/ArmSmcLib.h
+
 
 [Guids.common]
   gArmTokenSpaceGuid       = { 0xBB11ECFE, 0x820F, 0x4968, { 0xBB, 0xA6, 0xF7, 0x6A, 0xFE, 0x30, 0x25, 0x96 } }