diff --git a/label_studio/io_storages/base_models.py b/label_studio/io_storages/base_models.py
index 008896d550cb..bb22bdc68159 100644
--- a/label_studio/io_storages/base_models.py
+++ b/label_studio/io_storages/base_models.py
@@ -516,7 +516,7 @@ def _get_serialized_data(self, annotation):
         else:
             serializer_class = load_func(settings.STORAGE_ANNOTATION_SERIALIZER)
             # deprecated functionality - save only annotation
-            return serializer_class(annotation).data
+            return serializer_class(annotation, context={'project': self.project}).data
 
     def save_annotation(self, annotation):
         raise NotImplementedError