diff --git a/include/boost/smart_ptr/detail/sp_has_sync.hpp b/include/boost/smart_ptr/detail/sp_has_sync.hpp
index 7fcd09e..7e7860b 100644
--- a/include/boost/smart_ptr/detail/sp_has_sync.hpp
+++ b/include/boost/smart_ptr/detail/sp_has_sync.hpp
@@ -44,6 +44,10 @@
 #undef BOOST_SP_HAS_SYNC
 #endif
 
+#if defined (__PATHSCALE__)
+#undef BOOST_SP_HAS_SYNC
+#endif
+
 #endif // __GNUC__ * 100 + __GNUC_MINOR__ >= 401
 
 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_HAS_SYNC_HPP_INCLUDED