diff --git a/OldMdePkg/Library/BaseLib/BaseLib.msa b/OldMdePkg/Library/BaseLib/BaseLib.msa
index 2fa9ef2a22..96b303c8a4 100644
--- a/OldMdePkg/Library/BaseLib/BaseLib.msa
+++ b/OldMdePkg/Library/BaseLib/BaseLib.msa
@@ -522,7 +522,6 @@
     <Filename SupArchList="EBC">Ebc/CpuBreakpoint.c</Filename>
     <Filename SupArchList="EBC">Ebc/Synchronization.c</Filename>
     <Filename SupArchList="EBC">Synchronization.c</Filename>
-    <Filename>CheckSum.c</Filename>
   </SourceFiles>
   <NonProcessedFiles>
     <Filename>Ia32/ARShiftU64.asm</Filename>