diff --git a/llvm/lib/MC/MCAsmBackend.cpp b/llvm/lib/MC/MCAsmBackend.cpp
index 912bec9..9b1102c 100644
--- a/llvm/lib/MC/MCAsmBackend.cpp
+++ b/llvm/lib/MC/MCAsmBackend.cpp
@@ -16,6 +16,7 @@
 #include "llvm/MC/MCObjectWriter.h"
 #include "llvm/MC/MCWasmObjectWriter.h"
 #include "llvm/MC/MCWinCOFFObjectWriter.h"
+#include "llvm/MC/MCXCOFFObjectWriter.h"
 #include <cassert>
 #include <cstddef>
 #include <cstdint>
@@ -43,6 +44,9 @@
   case Triple::Wasm:
     return createWasmObjectWriter(cast<MCWasmObjectTargetWriter>(std::move(TW)),
                                   OS);
+  case Triple::XCOFF:
+    return createXCOFFObjectWriter(
+        cast<MCXCOFFObjectTargetWriter>(std::move(TW)), OS);
   default:
     llvm_unreachable("unexpected object format");
   }