diff --git a/include/boost/optional/detail/union_optional.hpp b/include/boost/optional/detail/union_optional.hpp
index 4993f58..ce14e3a 100644
--- a/include/boost/optional/detail/union_optional.hpp
+++ b/include/boost/optional/detail/union_optional.hpp
@@ -349,7 +349,9 @@ namespace boost {
     }
 
     template <typename U,
-              BOOST_OPTIONAL_REQUIRES(::std::is_constructible<T, U&&>)>
+              BOOST_OPTIONAL_REQUIRES(::std::is_constructible<T, U&&>),
+              BOOST_OPTIONAL_REQUIRES(!optional_detail::is_typed_in_place_factory<U>),
+              BOOST_OPTIONAL_REQUIRES(!optional_detail::is_in_place_factory<U>)>
     constexpr explicit optional(U&& v)
     : storage(optional_ns::in_place_init, optional_detail::forward_<U>(v))
     {}
@@ -463,7 +465,9 @@ namespace boost {
               BOOST_OPTIONAL_REQUIRES(!::std::is_same<typename ::std::decay<U>::type, optional>),
               BOOST_OPTIONAL_REQUIRES(!optional_detail::conjunction<::std::is_scalar<T>, ::std::is_same<T, BOOST_OPTIONAL_DECAY(U)>>),
               BOOST_OPTIONAL_REQUIRES(::std::is_constructible<T, U>),
-              BOOST_OPTIONAL_REQUIRES(::std::is_assignable<T&, U>)
+              BOOST_OPTIONAL_REQUIRES(::std::is_assignable<T&, U>),
+              BOOST_OPTIONAL_REQUIRES(!optional_detail::is_typed_in_place_factory<U>),
+              BOOST_OPTIONAL_REQUIRES(!optional_detail::is_in_place_factory<U>)
              >
     BOOST_OPTIONAL_CXX20_CONSTEXPR optional& operator=(U&& v)
     {
diff --git a/test/optional_test_inplace_factory.cpp b/test/optional_test_inplace_factory.cpp
index 9960c62..31a89ed 100644
--- a/test/optional_test_inplace_factory.cpp
+++ b/test/optional_test_inplace_factory.cpp
@@ -105,9 +105,42 @@ void test_assign()
 #endif
 }
 
+// begin Boost.Log case
+
+template <typename CharT>
+struct basic_formatter
+{
+  template< typename FunT >
+  basic_formatter(FunT&& fun) {}
+
+  template< typename FunT >
+  basic_formatter& operator= (FunT&& fun)
+  {
+      return *this;
+  }
+};
+
+template< typename CharT>
+struct chained_formatter
+{
+};
+
+void test_boost_log_case()
+{
+#ifndef BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
+
+  boost::optional<basic_formatter<char>> of( boost::in_place(chained_formatter<char>()) );
+  of = boost::in_place(chained_formatter<char>());
+
+#endif //BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
+}
+
+// end Boost.Log case
+
 int main()
 {
   test_ctor();
   test_assign();
+  test_boost_log_case();
   return boost::report_errors();
 }
diff --git a/test/optional_test_msvc_bug_workaround.cpp b/test/optional_test_msvc_bug_workaround.cpp
index 8d37068..04448c0 100644
--- a/test/optional_test_msvc_bug_workaround.cpp
+++ b/test/optional_test_msvc_bug_workaround.cpp
@@ -32,6 +32,7 @@ void test()
   //BOOST_TEST(v);
   boost::optional<boost::optional<int>> vv;
   bool xx = vv?true : false;
+  (void)xx;
   BOOST_TEST_EQ(*v, 7);
 #endif
 }