diff --git a/unittests/chrono.cpp b/unittests/chrono.cpp
index 05125fd4..d83cb352 100644
--- a/unittests/chrono.cpp
+++ b/unittests/chrono.cpp
@@ -3,75 +3,74 @@
 template <class IArchive, class OArchive>
 void test_chrono()
 {
-  std::chrono::steady_clock::now();
-  //for(int ii=0; ii<100; ++ii)
-  //{
-  //  auto o_timePoint1 = std::chrono::system_clock::now();
-  //  #ifndef CEREAL_OLDER_GCC
-  //  auto o_timePoint2 = std::chrono::steady_clock::now();
-  //  #endif // CEREAL_OLDER_GCC
-  //  auto o_timePoint3 = std::chrono::high_resolution_clock::now();
+  for(int ii=0; ii<100; ++ii)
+  {
+    auto o_timePoint1 = std::chrono::system_clock::now();
+    #ifndef CEREAL_OLDER_GCC
+    auto o_timePoint2 = std::chrono::steady_clock::now();
+    #endif // CEREAL_OLDER_GCC
+    auto o_timePoint3 = std::chrono::high_resolution_clock::now();
 
-  //  auto o_duration1 = std::chrono::system_clock::now() - o_timePoint1;
-  //  #ifndef CEREAL_OLDER_GCC
-  //  auto o_duration2 = std::chrono::steady_clock::now() - o_timePoint2;
-  //  #endif // CEREAL_OLDER_GCC
-  //  auto o_duration3 = std::chrono::high_resolution_clock::now() - o_timePoint3;
+    auto o_duration1 = std::chrono::system_clock::now() - o_timePoint1;
+    #ifndef CEREAL_OLDER_GCC
+    auto o_duration2 = std::chrono::steady_clock::now() - o_timePoint2;
+    #endif // CEREAL_OLDER_GCC
+    auto o_duration3 = std::chrono::high_resolution_clock::now() - o_timePoint3;
 
-  //  std::ostringstream os;
-  //  {
-  //    OArchive oar(os);
+    std::ostringstream os;
+    {
+      OArchive oar(os);
 
-  //    oar(o_timePoint1);
-  //    #ifndef CEREAL_OLDER_GCC
-  //    oar(o_timePoint2);
-  //    #endif // CEREAL_OLDER_GCC
-  //    oar(o_timePoint3);
-  //    oar(o_duration1);
-  //    #ifndef CEREAL_OLDER_GCC
-  //    oar(o_duration2);
-  //    #endif // CEREAL_OLDER_GCC
-  //    oar(o_duration3);
-  //  }
+      oar(o_timePoint1);
+      #ifndef CEREAL_OLDER_GCC
+      oar(o_timePoint2);
+      #endif // CEREAL_OLDER_GCC
+      oar(o_timePoint3);
+      oar(o_duration1);
+      #ifndef CEREAL_OLDER_GCC
+      oar(o_duration2);
+      #endif // CEREAL_OLDER_GCC
+      oar(o_duration3);
+    }
 
-  //  decltype(o_timePoint1) i_timePoint1;
-  //  #ifndef CEREAL_OLDER_GCC
-  //  decltype(o_timePoint2) i_timePoint2;
-  //  #endif // CEREAL_OLDER_GCC
-  //  decltype(o_timePoint3) i_timePoint3;
-  //  decltype(o_duration1) i_duration1;
-  //  #ifndef CEREAL_OLDER_GCC
-  //  decltype(o_duration2) i_duration2;
-  //  #endif // CEREAL_OLDER_GCC
-  //  decltype(o_duration3) i_duration3;
+    decltype(o_timePoint1) i_timePoint1;
+    #ifndef CEREAL_OLDER_GCC
+    decltype(o_timePoint2) i_timePoint2;
+    #endif // CEREAL_OLDER_GCC
+    decltype(o_timePoint3) i_timePoint3;
+    decltype(o_duration1) i_duration1;
+    #ifndef CEREAL_OLDER_GCC
+    decltype(o_duration2) i_duration2;
+    #endif // CEREAL_OLDER_GCC
+    decltype(o_duration3) i_duration3;
 
-  //  std::istringstream is(os.str());
-  //  {
-  //    IArchive iar(is);
+    std::istringstream is(os.str());
+    {
+      IArchive iar(is);
 
-  //    iar(i_timePoint1);
-  //    #ifndef CEREAL_OLDER_GCC
-  //    iar(i_timePoint2);
-  //    #endif // CEREAL_OLDER_GCC
-  //    iar(i_timePoint3);
-  //    iar(i_duration1);
-  //    #ifndef CEREAL_OLDER_GCC
-  //    iar(i_duration2);
-  //    #endif // CEREAL_OLDER_GCC
-  //    iar(i_duration3);
-  //  }
+      iar(i_timePoint1);
+      #ifndef CEREAL_OLDER_GCC
+      iar(i_timePoint2);
+      #endif // CEREAL_OLDER_GCC
+      iar(i_timePoint3);
+      iar(i_duration1);
+      #ifndef CEREAL_OLDER_GCC
+      iar(i_duration2);
+      #endif // CEREAL_OLDER_GCC
+      iar(i_duration3);
+    }
 
-  //  BOOST_CHECK( o_timePoint1 == i_timePoint1 );
-  //  #ifndef CEREAL_OLDER_GCC
-  //  BOOST_CHECK( o_timePoint2 == i_timePoint2 );
-  //  #endif // CEREAL_OLDER_GCC
-  //  BOOST_CHECK( o_timePoint3 == i_timePoint3 );
-  //  BOOST_CHECK( o_duration1 == i_duration1 );
-  //  #ifndef CEREAL_OLDER_GCC
-  //  BOOST_CHECK( o_duration2 == i_duration2 );
-  //  #endif // CEREAL_OLDER_GCC
-  //  BOOST_CHECK( o_duration3 == i_duration3 );
-  //}
+    BOOST_CHECK( o_timePoint1 == i_timePoint1 );
+    #ifndef CEREAL_OLDER_GCC
+    BOOST_CHECK( o_timePoint2 == i_timePoint2 );
+    #endif // CEREAL_OLDER_GCC
+    BOOST_CHECK( o_timePoint3 == i_timePoint3 );
+    BOOST_CHECK( o_duration1 == i_duration1 );
+    #ifndef CEREAL_OLDER_GCC
+    BOOST_CHECK( o_duration2 == i_duration2 );
+    #endif // CEREAL_OLDER_GCC
+    BOOST_CHECK( o_duration3 == i_duration3 );
+  }
 }
 
 BOOST_AUTO_TEST_CASE( binary_chrono )