diff --git a/include/boost/system/detail/error_code.ipp b/include/boost/system/detail/error_code.ipp
index 37d0a63..71c60f6 100644
--- a/include/boost/system/detail/error_code.ipp
+++ b/include/boost/system/detail/error_code.ipp
@@ -21,9 +21,7 @@
 #include <cstring> // for strerror/strerror_r
 
 # if defined( BOOST_WINDOWS_API )
-#   include <winerror.h>
-#   include <boost/detail/winapi/error_handling.hpp>
-#   include <boost/detail/winapi/character_code_conversion.hpp>
+#   include <windows.h>
 #   if !BOOST_PLAT_WINDOWS_RUNTIME
 #     include <boost/system/detail/local_free_on_destruction.hpp>
 #   endif
@@ -374,12 +372,12 @@ namespace
     std::wstring buf(128, wchar_t());
     for (;;)
     {
-        boost::detail::winapi::DWORD_ retval = boost::detail::winapi::FormatMessageW(
-            boost::detail::winapi::FORMAT_MESSAGE_FROM_SYSTEM_ |
-            boost::detail::winapi::FORMAT_MESSAGE_IGNORE_INSERTS_,
+        DWORD retval = ::FormatMessageW(
+            FORMAT_MESSAGE_FROM_SYSTEM |
+            FORMAT_MESSAGE_IGNORE_INSERTS,
             NULL,
             ev,
-            boost::detail::winapi::MAKELANGID_(boost::detail::winapi::LANG_NEUTRAL_, boost::detail::winapi::SUBLANG_DEFAULT_), // Default language
+            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
             &buf[0],
             buf.size(),
             NULL
@@ -390,7 +388,7 @@ namespace
             buf.resize(retval);
             break;
         }
-        else if (boost::detail::winapi::GetLastError() != ERROR_INSUFFICIENT_BUFFER)
+        else if ( ::GetLastError() != ERROR_INSUFFICIENT_BUFFER )
         {
             return std::string("Unknown error");
         }
@@ -401,23 +399,23 @@ namespace
     }
     
     int num_chars = (buf.size() + 1) * 2;
-    boost::detail::winapi::LPSTR_ narrow_buffer = (boost::detail::winapi::LPSTR_)_alloca(num_chars);
-    if (boost::detail::winapi::WideCharToMultiByte(boost::detail::winapi::CP_ACP_, 0, buf.c_str(), -1, narrow_buffer, num_chars, NULL, NULL) == 0)
+    LPSTR narrow_buffer = (LPSTR)_alloca( num_chars );
+    if (::WideCharToMultiByte(CP_ACP, 0, buf.c_str(), -1, narrow_buffer, num_chars, NULL, NULL) == 0)
     {
         return std::string("Unknown error");
     }
 
     std::string str( narrow_buffer );
 #else
-    boost::detail::winapi::LPVOID_ lpMsgBuf = 0;
-    boost::detail::winapi::DWORD_ retval = boost::detail::winapi::FormatMessageA(
-        boost::detail::winapi::FORMAT_MESSAGE_ALLOCATE_BUFFER_ |
-        boost::detail::winapi::FORMAT_MESSAGE_FROM_SYSTEM_ |
-        boost::detail::winapi::FORMAT_MESSAGE_IGNORE_INSERTS_,
+    LPVOID lpMsgBuf = 0;
+    DWORD retval = ::FormatMessageA(
+        FORMAT_MESSAGE_ALLOCATE_BUFFER |
+        FORMAT_MESSAGE_FROM_SYSTEM |
+        FORMAT_MESSAGE_IGNORE_INSERTS,
         NULL,
         ev,
-        boost::detail::winapi::MAKELANGID_(boost::detail::winapi::LANG_NEUTRAL_, boost::detail::winapi::SUBLANG_DEFAULT_), // Default language
-        (boost::detail::winapi::LPSTR_) &lpMsgBuf,
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
+        (LPSTR) &lpMsgBuf,
         0,
         NULL
     );
@@ -425,7 +423,7 @@ namespace
     if (retval == 0)
         return std::string("Unknown error");
 
-    std::string str(static_cast<boost::detail::winapi::LPCSTR_>(lpMsgBuf));
+    std::string str( static_cast<LPCSTR>(lpMsgBuf) );
 # endif
     while ( str.size()
       && (str[str.size()-1] == '\n' || str[str.size()-1] == '\r') )
diff --git a/include/boost/system/detail/local_free_on_destruction.hpp b/include/boost/system/detail/local_free_on_destruction.hpp
index 25f879b..110024f 100644
--- a/include/boost/system/detail/local_free_on_destruction.hpp
+++ b/include/boost/system/detail/local_free_on_destruction.hpp
@@ -12,8 +12,6 @@
 #ifndef BOOST_SYSTEM_LOCAL_FREE_ON_EXIT_HPP
 #define BOOST_SYSTEM_LOCAL_FREE_ON_EXIT_HPP
 
-#include <boost/detail/winapi/local_memory.hpp>
-
 namespace boost {
 namespace system {
 namespace detail {
@@ -26,7 +24,7 @@ public:
 
   ~local_free_on_destruction()
   {
-    boost::detail::winapi::LocalFree(p_);
+    ::LocalFree(p_);
   }
 
 private: