diff --git a/test/unordered/serialization_tests.cpp b/test/unordered/serialization_tests.cpp
index 82752186..42da2c8f 100644
--- a/test/unordered/serialization_tests.cpp
+++ b/test/unordered/serialization_tests.cpp
@@ -90,6 +90,7 @@ namespace {
       input_archive ia(iss);
       ia >> boost::serialization::make_nvp("container", c2);
       ia >> boost::serialization::make_nvp("iterators", v2);
+      BOOST_TEST(c == c2);
       BOOST_TEST_EQ(v.size(), v2.size());
 
       for (std::size_t i=0; i < v.size(); ++i) {