diff --git a/asio/include/asio/detail/impl/win_iocp_file_service.ipp b/asio/include/asio/detail/impl/win_iocp_file_service.ipp
index a698a2eda8..72739f3412 100644
--- a/asio/include/asio/detail/impl/win_iocp_file_service.ipp
+++ b/asio/include/asio/detail/impl/win_iocp_file_service.ipp
@@ -95,7 +95,10 @@ asio::error_code win_iocp_file_service::open(
     flags |= FILE_FLAG_WRITE_THROUGH;
 
   impl.offset_ = 0;
-  HANDLE handle = ::CreateFileA(path, access, share, 0, disposition, flags, 0);
+  size_t len = std::strlen(path) + 1;
+  auto wpath = std::make_unique<wchar_t[]>(len);
+  std::mbstowcs(wpath.get(), path, len);
+  HANDLE handle = ::CreateFileW(wpath.get(), access, share, 0, disposition, flags, 0);
   if (handle != INVALID_HANDLE_VALUE)
   {
     if (disposition == OPEN_ALWAYS)