diff --git a/boost/test/impl/execution_monitor.ipp b/boost/test/impl/execution_monitor.ipp
index 4f15b49..a481a88 100644
--- a/boost/test/impl/execution_monitor.ipp
+++ b/boost/test/impl/execution_monitor.ipp
@@ -276,6 +276,16 @@ struct fpe_except_guard {
     unsigned m_previosly_enabled;
 };
 
+struct forward {
+    explicit    forward( boost::function<void ()> const& F ) : m_F( F ) {}
+
+    int         operator()() { m_F(); return 0; }
+
+    boost::function<void ()> const& m_F;
+};
+
+
+
 } // namespace detail
 
 #if defined(BOOST_SIGACTION_BASED_SIGNAL_HANDLING)
@@ -1276,15 +1286,7 @@ execution_monitor::execute( boost::function<int ()> const& F )
 void
 execution_monitor::vexecute( boost::function<void ()> const& F )
 {
-    struct forward {
-        explicit    forward( boost::function<void ()> const& F ) : m_F( F ) {}
-
-        int         operator()() { m_F(); return 0; }
-
-        boost::function<void ()> const& m_F;
-    };
-
-    execute( forward( F ) );
+    execute( detail::forward( F ) );
 }
 
 // ************************************************************************** //