diff --git a/llvm/lib/Object/ArchiveWriter.cpp b/llvm/lib/Object/ArchiveWriter.cpp
index 5b233aa..e1c35ed 100644
--- a/llvm/lib/Object/ArchiveWriter.cpp
+++ b/llvm/lib/Object/ArchiveWriter.cpp
@@ -14,6 +14,7 @@
 #include "llvm/Object/ArchiveWriter.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/BinaryFormat/Magic.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/Object/Archive.h"
 #include "llvm/Object/ObjectFile.h"
@@ -290,7 +291,7 @@
     MemoryBufferRef MemberBuffer = Members[MemberNum].Buf->getMemBufferRef();
     Expected<std::unique_ptr<object::SymbolicFile>> ObjOrErr =
         object::SymbolicFile::createSymbolicFile(
-            MemberBuffer, sys::fs::file_magic::unknown, &Context);
+            MemberBuffer, llvm::file_magic::unknown, &Context);
     if (!ObjOrErr) {
       // FIXME: check only for "not an object file" errors.
       consumeError(ObjOrErr.takeError());