--- a/libs/thread/src/pthread/thread.cpp
+++ b/libs/thread/src/pthread/thread.cpp
@@ -388,8 +388,6 @@ namespace boost
     {
 #if defined(PTW32_VERSION) || defined(__hpux)
         return pthread_num_processors_np();
-#elif defined(__linux__)
-        return get_nprocs();
 #elif defined(__APPLE__) || defined(__FreeBSD__)
         int count;
         size_t size=sizeof(count);
@@ -397,6 +395,8 @@ namespace boost
 #elif defined(BOOST_HAS_UNISTD_H) && defined(_SC_NPROCESSORS_ONLN)
         int const count=sysconf(_SC_NPROCESSORS_ONLN);
         return (count>0)?count:0;
+#elif defined(__linux__)
+        return get_nprocs();
 #else
         return 0;
 #endif