diff --git a/llvm/lib/Object/WindowsResource.cpp b/llvm/lib/Object/WindowsResource.cpp
index 693494a..b844955 100644
--- a/llvm/lib/Object/WindowsResource.cpp
+++ b/llvm/lib/Object/WindowsResource.cpp
@@ -441,19 +441,7 @@
 void WindowsResourceCOFFWriter::writeCOFFHeader() {
   // Write the COFF header.
   auto *Header = reinterpret_cast<coff_file_header *>(BufferStart);
-  switch (MachineType) {
-  case COFF::IMAGE_FILE_MACHINE_ARMNT:
-    Header->Machine = COFF::IMAGE_FILE_MACHINE_ARMNT;
-    break;
-  case COFF::IMAGE_FILE_MACHINE_AMD64:
-    Header->Machine = COFF::IMAGE_FILE_MACHINE_AMD64;
-    break;
-  case COFF::IMAGE_FILE_MACHINE_I386:
-    Header->Machine = COFF::IMAGE_FILE_MACHINE_I386;
-    break;
-  default:
-    Header->Machine = COFF::IMAGE_FILE_MACHINE_UNKNOWN;
-  }
+  Header->Machine = MachineType;
   Header->NumberOfSections = 2;
   Header->TimeDateStamp = getTime();
   Header->PointerToSymbolTable = SymbolTableOffset;
@@ -714,8 +702,11 @@
     case COFF::IMAGE_FILE_MACHINE_I386:
       Reloc->Type = COFF::IMAGE_REL_I386_DIR32NB;
       break;
+    case COFF::IMAGE_FILE_MACHINE_ARM64:
+      Reloc->Type = COFF::IMAGE_REL_ARM64_ADDR32NB;
+      break;
     default:
-      Reloc->Type = 0;
+      llvm_unreachable("unknown machine type");
     }
     CurrentOffset += sizeof(coff_relocation);
   }