diff --git a/include/boost/detail/lightweight_mutex.hpp b/include/boost/detail/lightweight_mutex.hpp
index a0936cb..e740d7f 100644
--- a/include/boost/detail/lightweight_mutex.hpp
+++ b/include/boost/detail/lightweight_mutex.hpp
@@ -30,10 +30,10 @@
 
 #if !defined(BOOST_HAS_THREADS)
 # include <boost/detail/lwm_nop.hpp>
-#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
-#  include <boost/detail/lwm_win32_cs.hpp>
 #elif defined(BOOST_HAS_PTHREADS)
 #  include <boost/detail/lwm_pthreads.hpp>
+#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
+#  include <boost/detail/lwm_win32_cs.hpp>
 #else
 // Use #define BOOST_DISABLE_THREADS to avoid the error
 #  error Unrecognized threading platform