1 files changed, 6 insertions, 3 deletions
diff --git a/boost/archive/detail/polymorphic_iarchive_route.hpp b/boost/archive/detail/polymorphic_iarchive_route.hpp
index a8eb7aa94a..2c57a3f51c 100644
--- a/boost/archive/detail/polymorphic_iarchive_route.hpp
+++ b/boost/archive/detail/polymorphic_iarchive_route.hpp
@@ -39,8 +39,8 @@ namespace serialization {
 namespace archive {
 namespace detail{
 
-class BOOST_ARCHIVE_DECL(BOOST_PP_EMPTY()) basic_iserializer;
-class BOOST_ARCHIVE_DECL(BOOST_PP_EMPTY()) basic_pointer_iserializer;
+class BOOST_ARCHIVE_DECL basic_iserializer;
+class BOOST_ARCHIVE_DECL basic_pointer_iserializer;
 
 #ifdef BOOST_MSVC
 #  pragma warning(push)
@@ -166,10 +166,13 @@ private:
     virtual void load_end(const char * name){
         ArchiveImplementation::load_end(name);
     }
-
     virtual void register_basic_serializer(const basic_iserializer & bis){
         ArchiveImplementation::register_basic_serializer(bis);
     }
+    virtual helper_collection &
+    get_helper_collection(){
+        return ArchiveImplementation::get_helper_collection();
+    }
 public:
     // this can't be inheriteded because they appear in mulitple
     // parents