diff --git a/include/boost/exception/error_info.hpp b/include/boost/exception/error_info.hpp
index 2e6832a..03b3da8 100644
--- a/include/boost/exception/error_info.hpp
+++ b/include/boost/exception/error_info.hpp
@@ -3,4 +3,7 @@
 //Distributed under the Boost Software License, Version 1.0. (See accompanying
 //file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
+#ifndef UUID_EE7ECCA0433B11E1923E37064924019B
+#define UUID_EE7ECCA0433B11E1923E37064924019B
 namespace boost { template <class Tag,class T> class error_info; }
+#endif