diff --git a/music_metadata/edi/records.py b/music_metadata/edi/records.py
index 0afd959..3279757 100644
--- a/music_metadata/edi/records.py
+++ b/music_metadata/edi/records.py
@@ -51,7 +51,7 @@ def __setattr__(self, key, value):
 
     def to_edi(self):
         output = ''
-        for label, field in self._fields.items():
+        for label, field in self.get_fields().items():
             value = getattr(self, label)
             s = field.to_edi(value)
             output += s