Index: lld/ELF/InputFiles.cpp
===================================================================
--- lld/ELF/InputFiles.cpp
+++ lld/ELF/InputFiles.cpp
@@ -1035,7 +1035,7 @@
   MemoryBufferRef MBRef(
       MB.getBuffer(),
       Saver.save(ArchiveName + MB.getBufferIdentifier() +
-                 (ArchiveName.empty() ? "" : utostr(OffsetInArchive))));
+                 (ArchiveName.empty() ? "" : utostr(reinterpret_cast<uint64_t>(MB.getBufferStart())))));
   Obj = CHECK(lto::InputFile::create(MBRef), this);
 
   Triple T(Obj->getTargetTriple());