diff --git a/test/virtual_functions.cpp b/test/virtual_functions.cpp
index 4d2405a3..68b58383 100644
--- a/test/virtual_functions.cpp
+++ b/test/virtual_functions.cpp
@@ -2,7 +2,6 @@
 // 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)
-#include <boost/assert.hpp>
 
 #include <boost/python/class.hpp>
 #include <boost/python/module.hpp>
@@ -12,6 +11,8 @@
 #include <boost/ref.hpp>
 #include <boost/utility.hpp>
 
+#include <boost/assert.hpp>
+
 using namespace boost::python;
 
 struct X