diff --git a/lldb/include/lldb/Host/FileSystem.h b/lldb/include/lldb/Host/FileSystem.h
index 269df10d42ce..dc733d7b1cca 100644
--- a/lldb/include/lldb/Host/FileSystem.h
+++ b/lldb/include/lldb/Host/FileSystem.h
@@ -124,9 +124,6 @@ public:
   std::error_code GetRealPath(const llvm::Twine &path,
                               llvm::SmallVectorImpl<char> &output) const;
 
-protected:
-  void SetFileSystem(llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs);
-
 private:
   static llvm::Optional<FileSystem> &InstanceImpl();
   llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> m_fs;
diff --git a/lldb/source/Host/common/FileSystem.cpp b/lldb/source/Host/common/FileSystem.cpp
index 73e74c1069f3..72aaba321f2f 100644
--- a/lldb/source/Host/common/FileSystem.cpp
+++ b/lldb/source/Host/common/FileSystem.cpp
@@ -47,10 +47,6 @@ Optional<FileSystem> &FileSystem::InstanceImpl() {
   return g_fs;
 }
 
-void FileSystem::SetFileSystem(IntrusiveRefCntPtr<vfs::FileSystem> fs) {
-  m_fs = fs;
-}
-
 sys::TimePoint<>
 FileSystem::GetModificationTime(const FileSpec &file_spec) const {
   return GetModificationTime(file_spec.GetPath());