diff --git a/core/admin.py b/core/admin.py
index e97b5a87..18f0a1fa 100644
--- a/core/admin.py
+++ b/core/admin.py
@@ -58,7 +58,7 @@ class I18NFieldsetMixin:
 
         trans_opts = translator.get_options_for_model(self.model)
         translation_fields = []
-        for orig in trans_opts.fields.keys():  # noqa: SIM118
+        for orig in trans_opts.local_fields:
             translation_fields.extend(get_translation_fields(orig))
 
         cleaned = []