src/win32/thread.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/win32/thread.cpp b/src/win32/thread.cpp
index 886e5d1..a8c1c34 100644
--- a/src/win32/thread.cpp
+++ b/src/win32/thread.cpp
@@ -529,9 +529,7 @@ namespace boost
     unsigned thread::physical_concurrency() BOOST_NOEXCEPT
     {
       // a bit too strict: Windows XP with SP3 would be sufficient
-#if BOOST_PLAT_WINDOWS_RUNTIME                                    \
-    || ( defined(BOOST_USE_WINAPI_VERSION) && ( BOOST_USE_WINAPI_VERSION <= BOOST_WINAPI_VERSION_WINXP ) ) \
-    || ( ( defined(__MINGW32__) && !defined(__MINGW64__) ) && _WIN32_WINNT < 0x0600)
+#if defined(BOOST_WINAPI_VERSION_WINXP)
         return 0;
 #else
         unsigned cores = 0;