diff --git a/include/ndnboost/cstdlib.hpp b/include/ndnboost/cstdlib.hpp
index f57725f..c3d124c 100644
--- a/include/ndnboost/cstdlib.hpp
+++ b/include/ndnboost/cstdlib.hpp
@@ -9,8 +9,8 @@
 //  Revision History
 //   26 Feb 01  Initial version (Beman Dawes)
 
-#ifndef BOOST_CSTDLIB_HPP
-#define BOOST_CSTDLIB_HPP
+#ifndef NDNBOOST_CSTDLIB_HPP
+#define NDNBOOST_CSTDLIB_HPP
 
 #include <cstdlib>