diff --git a/include/boost/asio/detail/impl/win_iocp_io_context.ipp b/include/boost/asio/detail/impl/win_iocp_io_context.ipp
index 72fa751c..524667a4 100644
--- a/include/boost/asio/detail/impl/win_iocp_io_context.ipp
+++ b/include/boost/asio/detail/impl/win_iocp_io_context.ipp
@@ -531,6 +531,7 @@ size_t win_iocp_io_context::do_one(DWORD msec,
 
 DWORD win_iocp_io_context::get_gqcs_timeout()
 {
+#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0600)
   OSVERSIONINFOEX osvi;
   ZeroMemory(&osvi, sizeof(osvi));
   osvi.dwOSVersionInfoSize = sizeof(osvi);
@@ -543,6 +544,9 @@ DWORD win_iocp_io_context::get_gqcs_timeout()
     return INFINITE;
 
   return default_gqcs_timeout;
+#else // !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0600)
+  return INFINITE;
+#endif // !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0600)
 }
 
 void win_iocp_io_context::do_add_timer_queue(timer_queue_base& queue)
diff --git a/include/boost/asio/detail/win_iocp_io_context.hpp b/include/boost/asio/detail/win_iocp_io_context.hpp
index 3904baeb..f91a70d0 100644
--- a/include/boost/asio/detail/win_iocp_io_context.hpp
+++ b/include/boost/asio/detail/win_iocp_io_context.hpp
@@ -273,11 +273,13 @@ private:
 
   enum
   {
+#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0600)
     // Timeout to use with GetQueuedCompletionStatus on older versions of
     // Windows. Some versions of windows have a "bug" where a call to
     // GetQueuedCompletionStatus can appear stuck even though there are events
     // waiting on the queue. Using a timeout helps to work around the issue.
     default_gqcs_timeout = 500,
+#endif // !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0600)
 
     // Maximum waitable timer timeout, in milliseconds.
     max_timeout_msec = 5 * 60 * 1000,