--- a/libs/filesystem/src/path.cpp
+++ b/libs/filesystem/src/path.cpp
@@ -349,7 +349,7 @@ namespace filesystem
    size_type end_pos(m_parent_path_end());
    return end_pos == string_type::npos
      ? path()
-     : path(m_pathname.c_str(), m_pathname.c_str() + end_pos);
+     : path(m_pathname.substr(0,end_pos));
   }
 
   path path::filename() const