diff --git a/DuetPkg/DuetPkgIa32.dsc b/DuetPkg/DuetPkgIa32.dsc
index fcc6c425fc..86346f30b6 100644
--- a/DuetPkg/DuetPkgIa32.dsc
+++ b/DuetPkg/DuetPkgIa32.dsc
@@ -105,6 +105,7 @@
   MtrrLib|UefiCpuPkg/Library/MtrrLib/MtrrLib.inf
   CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeCpuExceptionHandlerLib.inf
   LocalApicLib|UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.inf
+  MpInitLib|UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
 
   #
   # To save size, use NULL library for DebugLib and ReportStatusCodeLib.
diff --git a/DuetPkg/DuetPkgX64.dsc b/DuetPkg/DuetPkgX64.dsc
index 827f3df249..e0aeb5c1f0 100644
--- a/DuetPkg/DuetPkgX64.dsc
+++ b/DuetPkg/DuetPkgX64.dsc
@@ -106,6 +106,7 @@
   LockBoxLib|MdeModulePkg/Library/LockBoxNullLib/LockBoxNullLib.inf
   CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeCpuExceptionHandlerLib.inf
   LocalApicLib|UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.inf
+  MpInitLib|UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
 
   #
   # To save size, use NULL library for DebugLib and ReportStatusCodeLib.