diff --git a/include/nana/gui/filebox.hpp b/include/nana/gui/filebox.hpp
index 561dc5b7..1800eb9f 100644
--- a/include/nana/gui/filebox.hpp
+++ b/include/nana/gui/filebox.hpp
@@ -1,7 +1,7 @@
 /**
  *	Filebox
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2016 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
diff --git a/source/gui/filebox.cpp b/source/gui/filebox.cpp
index ec6c08a5..76e5d734 100644
--- a/source/gui/filebox.cpp
+++ b/source/gui/filebox.cpp
@@ -1,7 +1,7 @@
 /*
 *	Filebox
 *	Nana C++ Library(http://www.nanapro.org)
-*	Copyright(C) 2003-2016 Jinhao(cnjinhao@hotmail.com)
+*	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
 *
 *	Distributed under the Boost Software License, Version 1.0.
 *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -997,6 +997,9 @@ namespace nana
 
 			OPENFILENAME ofn;
 			memset(&ofn, 0, sizeof ofn);
+
+			internal_scope_guard lock;
+
 			ofn.lStructSize = sizeof(ofn);
 			ofn.hwndOwner = reinterpret_cast<HWND>(API::root(impl_->owner));
 			ofn.lpstrFile = &(wfile[0]);