diff --git a/doc/container.qbk b/doc/container.qbk
index 3561caf..9fc605e 100644
--- a/doc/container.qbk
+++ b/doc/container.qbk
@@ -1216,6 +1216,7 @@ use [*Boost.Container]? There are several reasons for that:
 [section:release_notes_boost_1_63_00 Boost 1.63 Release]
 
 * Fixed bugs:
+   * [@https://svn.boost.org/trac/boost/ticket/12534 Trac #12534:  ['"flat_map fails to compile if included after type_traits is instantiated under gcc"]].
    * [@https://svn.boost.org/trac/boost/ticket/12577 Trac #12577:  ['"Null reference in pair.hpp triggers runtime warning with -fsanitize=undefined"]].
    * [@https://github.com/boostorg/container/pull/41 GitHub #40: ['Fix parameter types in copy_move_algo.hpp: iterator_traits::difference_type -> allocator_traits::size_type]].
    * [@https://github.com/boostorg/container/pull/41 GitHub #41: ['Avoid -Wunreachable-code in do_allocate()]].
diff --git a/include/boost/container/detail/pair.hpp b/include/boost/container/detail/pair.hpp
index 63d1dea..4abff4b 100644
--- a/include/boost/container/detail/pair.hpp
+++ b/include/boost/container/detail/pair.hpp
@@ -428,36 +428,6 @@ inline void swap(pair<T1, T2>& x, pair<T1, T2>& y)
 }  //namespace container_detail {
 }  //namespace container {
 
-
-//Without this specialization recursive flat_(multi)map instantiation fails
-//because is_enum needs to instantiate the recursive pair, leading to a compilation error).
-//This breaks the cycle clearly stating that pair is not an enum avoiding any instantiation.
-template<class T>
-struct is_enum;
-
-template<class T, class U>
-struct is_enum< ::boost::container::container_detail::pair<T, U> >
-{
-   static const bool value = false;
-};
-
-template<class T, class U>
-struct is_enum< ::std::pair<T, U> >
-{
-   static const bool value = false;
-};
-
-template <class T>
-struct is_class;
-
-//This specialization is needed to avoid instantiation of pair in
-//is_class, and allow recursive maps.
-template <class T1, class T2>
-struct is_class< ::boost::container::container_detail::pair<T1, T2> >
-{
-   static const bool value = true;
-};
-
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
 
 template<class T1, class T2>