diff --git a/include/boost/smart_ptr/allocate_unique.hpp b/include/boost/smart_ptr/allocate_unique.hpp
index fc3896e..25b37ad 100644
--- a/include/boost/smart_ptr/allocate_unique.hpp
+++ b/include/boost/smart_ptr/allocate_unique.hpp
@@ -9,7 +9,6 @@ Distributed under the Boost Software License, Version 1.0.
 #define BOOST_SMART_PTR_ALLOCATE_UNIQUE_HPP
 
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
-#include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
 #include <boost/core/allocator_access.hpp>
 #include <boost/core/alloc_construct.hpp>
 #include <boost/core/empty_value.hpp>
@@ -27,6 +26,7 @@ Distributed under the Boost Software License, Version 1.0.
 #include <boost/config.hpp>
 #include <memory>
 #include <utility>
+#include <cstddef>
 
 namespace boost {
 namespace detail {
diff --git a/include/boost/smart_ptr/detail/sp_nullptr_t.hpp b/include/boost/smart_ptr/detail/sp_nullptr_t.hpp
deleted file mode 100644
index e877481..0000000
--- a/include/boost/smart_ptr/detail/sp_nullptr_t.hpp
+++ /dev/null
@@ -1,41 +0,0 @@
-#ifndef BOOST_SMART_PTR_DETAIL_SP_NULLPTR_T_HPP_INCLUDED
-#define BOOST_SMART_PTR_DETAIL_SP_NULLPTR_T_HPP_INCLUDED
-
-// MS compatible compilers support #pragma once
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
-# pragma once
-#endif
-
-//  detail/sp_nullptr_t.hpp
-//
-//  Copyright 2013 Peter Dimov
-//
-//  Distributed under the Boost Software License, Version 1.0.
-//  See accompanying file LICENSE_1_0.txt or copy at
-//  http://www.boost.org/LICENSE_1_0.txt
-
-#include <boost/config.hpp>
-#include <cstddef>
-
-namespace boost
-{
-
-namespace detail
-{
-
-#if !defined( BOOST_NO_CXX11_DECLTYPE ) && ( ( defined( __clang__ ) && !defined( _LIBCPP_VERSION ) ) || defined( __INTEL_COMPILER ) )
-
-    typedef decltype(nullptr) sp_nullptr_t;
-
-#else
-
-    typedef std::nullptr_t sp_nullptr_t;
-
-#endif
-
-} // namespace detail
-
-} // namespace boost
-
-#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_NULLPTR_T_HPP_INCLUDED
diff --git a/include/boost/smart_ptr/intrusive_ptr.hpp b/include/boost/smart_ptr/intrusive_ptr.hpp
index c76680d..f2daf91 100644
--- a/include/boost/smart_ptr/intrusive_ptr.hpp
+++ b/include/boost/smart_ptr/intrusive_ptr.hpp
@@ -14,7 +14,6 @@
 //
 
 #include <boost/smart_ptr/detail/sp_convertible.hpp>
-#include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
 #include <boost/assert.hpp>
 #include <boost/config.hpp>
@@ -22,6 +21,7 @@
 
 #include <functional>           // for std::less
 #include <iosfwd>               // for std::basic_ostream
+#include <cstddef>
 
 namespace boost
 {
diff --git a/include/boost/smart_ptr/scoped_array.hpp b/include/boost/smart_ptr/scoped_array.hpp
index 9051292..43bee79 100644
--- a/include/boost/smart_ptr/scoped_array.hpp
+++ b/include/boost/smart_ptr/scoped_array.hpp
@@ -10,12 +10,10 @@
 //
 //  See http://www.boost.org/libs/smart_ptr/ for documentation.
 
-#include <boost/config.hpp>
-#include <boost/assert.hpp>
-#include <boost/core/checked_delete.hpp>
-#include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
-
+#include <boost/core/checked_delete.hpp>
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
 #include <boost/config/workaround.hpp>
 
 #include <cstddef>            // for std::ptrdiff_t
diff --git a/include/boost/smart_ptr/scoped_ptr.hpp b/include/boost/smart_ptr/scoped_ptr.hpp
index 1e2f3a9..1909496 100644
--- a/include/boost/smart_ptr/scoped_ptr.hpp
+++ b/include/boost/smart_ptr/scoped_ptr.hpp
@@ -10,13 +10,13 @@
 //
 //  See http://www.boost.org/libs/smart_ptr/ for documentation.
 
-#include <boost/config.hpp>
-#include <boost/assert.hpp>
-#include <boost/core/checked_delete.hpp>
-#include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
 #include <boost/smart_ptr/detail/sp_disable_deprecated.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
+#include <boost/core/checked_delete.hpp>
+#include <boost/assert.hpp>
 #include <boost/config/workaround.hpp>
+#include <boost/config.hpp>
+#include <cstddef>
 
 #ifndef BOOST_NO_AUTO_PTR
 # include <memory>          // for std::auto_ptr
diff --git a/include/boost/smart_ptr/shared_array.hpp b/include/boost/smart_ptr/shared_array.hpp
index 557b07c..e032983 100644
--- a/include/boost/smart_ptr/shared_array.hpp
+++ b/include/boost/smart_ptr/shared_array.hpp
@@ -14,22 +14,17 @@
 //  See http://www.boost.org/libs/smart_ptr/ for documentation.
 //
 
-#include <boost/config.hpp>   // for broken compiler workarounds
-
-#include <memory>             // TR1 cyclic inclusion fix
-
-#include <boost/assert.hpp>
-#include <boost/core/checked_delete.hpp>
-
 #include <boost/smart_ptr/shared_ptr.hpp>
 #include <boost/smart_ptr/detail/shared_count.hpp>
-#include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
+#include <boost/core/checked_delete.hpp>
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
 #include <boost/config/workaround.hpp>
 
-#include <cstddef>            // for std::ptrdiff_t
 #include <algorithm>          // for std::swap
 #include <functional>         // for std::less
+#include <cstddef>            // for std::ptrdiff_t
 
 namespace boost
 {
diff --git a/include/boost/smart_ptr/shared_ptr.hpp b/include/boost/smart_ptr/shared_ptr.hpp
index 8fb02ba..cec0930 100644
--- a/include/boost/smart_ptr/shared_ptr.hpp
+++ b/include/boost/smart_ptr/shared_ptr.hpp
@@ -16,7 +16,6 @@
 
 #include <boost/smart_ptr/detail/shared_count.hpp>
 #include <boost/smart_ptr/detail/sp_convertible.hpp>
-#include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
 #include <boost/smart_ptr/detail/sp_disable_deprecated.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
 #include <boost/core/checked_delete.hpp>
diff --git a/test/local_sp_test.cpp b/test/local_sp_test.cpp
index d0262b3..4d35c50 100644
--- a/test/local_sp_test.cpp
+++ b/test/local_sp_test.cpp
@@ -222,7 +222,7 @@ static void deleter_constructor()
 
 // nullptr_deleter_constructor
 
-void deleter3( boost::detail::sp_nullptr_t )
+void deleter3( std::nullptr_t )
 {
     ++m;
 }
diff --git a/test/sp_nullptr_test.cpp b/test/sp_nullptr_test.cpp
index 341465b..e5e276a 100644
--- a/test/sp_nullptr_test.cpp
+++ b/test/sp_nullptr_test.cpp
@@ -9,7 +9,6 @@
 //
 
 #include <boost/shared_ptr.hpp>
-#include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
 #include <boost/core/lightweight_test.hpp>
 #include <cstddef>
 #include <memory>
@@ -36,7 +35,7 @@ private:
 
 int X::instances = 0;
 
-void f( boost::detail::sp_nullptr_t )
+void f( std::nullptr_t )
 {
 }