diff --git a/test/std_interop_test7.cpp b/test/std_interop_test7.cpp
index 7d0820b..c8e0670 100644
--- a/test/std_interop_test7.cpp
+++ b/test/std_interop_test7.cpp
@@ -21,6 +21,9 @@ int main()
     {
         boost::system::error_code e1 = make_error_code( boost::system::errc::bad_address );
 
+        BOOST_TEST( e1 == boost::system::errc::bad_address );
+        BOOST_TEST_NOT( e1 != boost::system::errc::bad_address );
+
         BOOST_TEST( e1 == std::errc::bad_address );
         BOOST_TEST_NOT( e1 != std::errc::bad_address );
     }
@@ -28,6 +31,9 @@ int main()
     {
         boost::system::error_code e1 = make_error_code( std::errc::bad_address );
 
+        BOOST_TEST( e1 == boost::system::errc::bad_address );
+        BOOST_TEST_NOT( e1 != boost::system::errc::bad_address );
+
         BOOST_TEST( e1 == std::errc::bad_address );
         BOOST_TEST_NOT( e1 != std::errc::bad_address );
     }