diff --git a/include/boost/detail/winapi/handles.hpp b/include/boost/detail/winapi/handles.hpp
index d4cffc8..7108daa 100644
--- a/include/boost/detail/winapi/handles.hpp
+++ b/include/boost/detail/winapi/handles.hpp
@@ -24,14 +24,20 @@ namespace winapi
 #if defined( BOOST_USE_WINDOWS_H )
     using ::CloseHandle;
     using ::DuplicateHandle;
+
+    const DWORD_ duplicate_close_source = DUPLICATE_CLOSE_SOURCE;
+    const DWORD_ duplicate_same_access = DUPLICATE_SAME_ACCESS;
+    const HANDLE_ invalid_handle_value = INVALID_HANDLE_VALUE;
 #else
-extern "C" { 
-    __declspec(dllimport) int __stdcall 
+extern "C" {
+    __declspec(dllimport) int __stdcall
         CloseHandle(void*);
-    __declspec(dllimport) int __stdcall 
+    __declspec(dllimport) int __stdcall
         DuplicateHandle(void*,void*,void*,void**,unsigned long,int,unsigned long);
 }
-
+    const DWORD_ duplicate_close_source = 1;
+    const DWORD_ duplicate_same_access = 2;
+    const HANDLE_ invalid_handle_value = (HANDLE_)(-1);
 #endif
 }
 }