diff --git a/include/boost/smart_ptr/detail/sp_has_sync_intrinsics.hpp b/include/boost/smart_ptr/detail/sp_has_sync_intrinsics.hpp
index 92684be..875d869 100644
--- a/include/boost/smart_ptr/detail/sp_has_sync_intrinsics.hpp
+++ b/include/boost/smart_ptr/detail/sp_has_sync_intrinsics.hpp
@@ -1,5 +1,5 @@
-#ifndef BOOST_SMART_PTR_DETAIL_SP_HAS_SYNC_HPP_INCLUDED
-#define BOOST_SMART_PTR_DETAIL_SP_HAS_SYNC_HPP_INCLUDED
+#ifndef BOOST_SMART_PTR_DETAIL_SP_HAS_SYNC_INTRINSICS_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_HAS_SYNC_INTRINSICS_HPP_INCLUDED
 
 // MS compatible compilers support #pragma once
 
@@ -64,6 +64,6 @@
 
 #endif
 
-#endif // #ifndef BOOST_SP_NO_SYNC
+#endif // #if !defined( BOOST_SP_NO_SYNC_INTRINSICS ) && !defined( BOOST_SP_NO_SYNC )
 
-#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_HAS_SYNC_HPP_INCLUDED
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_HAS_SYNC_INTRINSICS_HPP_INCLUDED