diff --git a/include/boost/filesystem/detail/path_traits.hpp b/include/boost/filesystem/detail/path_traits.hpp
index d68afc02f..bbe70ab32 100644
--- a/include/boost/filesystem/detail/path_traits.hpp
+++ b/include/boost/filesystem/detail/path_traits.hpp
@@ -42,7 +42,7 @@ namespace boost {
 template< typename, typename > class basic_string_view;
 
 namespace container {
-template< typename, typename, typename > class basic_string;
+template< typename, typename, typename, typename> class basic_string;
 } // namespace container
 
 namespace filesystem {
@@ -204,7 +204,7 @@ struct path_source_traits< std::wstring >
 };
 
 template< >
-struct path_source_traits< boost::container::basic_string< char, std::char_traits< char >, void > >
+struct path_source_traits< boost::container::basic_string< char, std::char_traits< char >, void, void > >
 {
     typedef boost_container_string_tag tag_type;
     typedef char char_type;
@@ -212,7 +212,7 @@ struct path_source_traits< boost::container::basic_string< char, std::char_trait
 };
 
 template< >
-struct path_source_traits< boost::container::basic_string< wchar_t, std::char_traits< wchar_t >, void > >
+struct path_source_traits< boost::container::basic_string< wchar_t, std::char_traits< wchar_t >, void, void > >
 {
     typedef boost_container_string_tag tag_type;
     typedef wchar_t char_type;
@@ -490,8 +490,8 @@ yes_type check_convertible(const char*);
 yes_type check_convertible(const wchar_t*);
 yes_type check_convertible(std::string const&);
 yes_type check_convertible(std::wstring const&);
-yes_type check_convertible(boost::container::basic_string< char, std::char_traits< char >, void > const&);
-yes_type check_convertible(boost::container::basic_string< wchar_t, std::char_traits< wchar_t >, void > const&);
+yes_type check_convertible(boost::container::basic_string< char, std::char_traits< char >, void, void > const&);
+yes_type check_convertible(boost::container::basic_string< wchar_t, std::char_traits< wchar_t >, void, void > const&);
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 yes_type check_convertible(std::string_view const&);
 yes_type check_convertible(std::wstring_view const&);
@@ -563,8 +563,8 @@ yes_type check_convertible(const char*);
 yes_type check_convertible(const wchar_t*);
 yes_type check_convertible(std::string const&);
 yes_type check_convertible(std::wstring const&);
-yes_type check_convertible(boost::container::basic_string< char, std::char_traits< char >, void > const&);
-yes_type check_convertible(boost::container::basic_string< wchar_t, std::char_traits< wchar_t >, void > const&);
+yes_type check_convertible(boost::container::basic_string< char, std::char_traits< char >, void, void > const&);
+yes_type check_convertible(boost::container::basic_string< wchar_t, std::char_traits< wchar_t >, void, void > const&);
 yes_type check_convertible(boost::basic_string_view< char, std::char_traits< char > > const&);
 yes_type check_convertible(boost::basic_string_view< wchar_t, std::char_traits< wchar_t > > const&);
 no_type check_convertible(std::nullptr_t);
@@ -643,24 +643,24 @@ BOOST_FORCEINLINE typename Callback::result_type dispatch_convertible_impl(std::
 template< typename Source, typename Callback >
 BOOST_FORCEINLINE typename Callback::result_type dispatch_convertible_impl
 (
-    boost::container::basic_string< char, std::char_traits< char >, void > const& source,
+    boost::container::basic_string< char, std::char_traits< char >, void, void > const& source,
     Callback cb,
     const codecvt_type* cvt
 )
 {
-    typedef typename path_traits::make_dependent< boost::container::basic_string< char, std::char_traits< char >, void >, Source >::type source_t;
+    typedef typename path_traits::make_dependent< boost::container::basic_string< char, std::char_traits< char >, void, void >, Source >::type source_t;
     return path_traits::dispatch(static_cast< source_t const& >(source), cb, cvt);
 }
 
 template< typename Source, typename Callback >
 BOOST_FORCEINLINE typename Callback::result_type dispatch_convertible_impl
 (
-    boost::container::basic_string< wchar_t, std::char_traits< wchar_t >, void > const& source,
+    boost::container::basic_string< wchar_t, std::char_traits< wchar_t >, void, void > const& source,
     Callback cb,
     const codecvt_type* cvt
 )
 {
-    typedef typename path_traits::make_dependent< boost::container::basic_string< wchar_t, std::char_traits< wchar_t >, void >, Source >::type source_t;
+    typedef typename path_traits::make_dependent< boost::container::basic_string< wchar_t, std::char_traits< wchar_t >, void, void >, Source >::type source_t;
     return path_traits::dispatch(static_cast< source_t const& >(source), cb, cvt);
 }