diff --git a/Filtered_kernel/include/CGAL/Filtered_predicate_with_state.h b/Filtered_kernel/include/CGAL/Filtered_predicate_with_state.h
index 4f652753aa7..684e2eea8db 100644
--- a/Filtered_kernel/include/CGAL/Filtered_predicate_with_state.h
+++ b/Filtered_kernel/include/CGAL/Filtered_predicate_with_state.h
@@ -38,9 +38,9 @@ class Filtered_predicate_with_state
 {
   C2E c2e;
   C2A c2a;
+  O1  o1;
   mutable boost::optional<EP>  oep;
   AP  ap;
-  O1  o1;
   typedef typename AP::result_type  Ares;
 
 public: