diff --git a/include/boost/unordered/detail/implementation.hpp b/include/boost/unordered/detail/implementation.hpp
index 78850bba..65592760 100644
--- a/include/boost/unordered/detail/implementation.hpp
+++ b/include/boost/unordered/detail/implementation.hpp
@@ -13,11 +13,9 @@
 #include <boost/assert.hpp>
 #include <boost/detail/no_exceptions_support.hpp>
 #include <boost/detail/select_type.hpp>
-#include <boost/detail/select_type.hpp>
 #include <boost/iterator/iterator_categories.hpp>
 #include <boost/limits.hpp>
 #include <boost/move/move.hpp>
-#include <boost/move/move.hpp>
 #include <boost/preprocessor/cat.hpp>
 #include <boost/preprocessor/repetition/enum.hpp>
 #include <boost/preprocessor/repetition/enum_binary_params.hpp>
@@ -26,7 +24,6 @@
 #include <boost/preprocessor/seq/enum.hpp>
 #include <boost/preprocessor/seq/size.hpp>
 #include <boost/swap.hpp>
-#include <boost/swap.hpp>
 #include <boost/throw_exception.hpp>
 #include <boost/tuple/tuple.hpp>
 #include <boost/type_traits/add_lvalue_reference.hpp>
@@ -40,7 +37,6 @@
 #include <boost/unordered/detail/fwd.hpp>
 #include <boost/utility/addressof.hpp>
 #include <boost/utility/enable_if.hpp>
-#include <boost/utility/enable_if.hpp>
 #include <cmath>
 #include <iterator>
 #include <stdexcept>