diff --git a/api/model/embedding_search/page_index.py b/api/model/embedding_search/page_index.py
index c995dce..0081050 100644
--- a/api/model/embedding_search/page_index.py
+++ b/api/model/embedding_search/page_index.py
@@ -36,16 +36,16 @@ def create_page_index_model(collection_id: int):
     if collection_id in page_index_model_list:
         return page_index_model_list[collection_id]
     else:
-        class PageIndexModel(AbstractPageIndexModel):
+        class _PageIndexModel(AbstractPageIndexModel):
             __tablename__ = "embedding_search_page_index_%s" % str(collection_id)
     
             embedding_index = sqlalchemy.Index(__tablename__ + "_embedding_idx", AbstractPageIndexModel.embedding,
                                             postgresql_using='ivfflat',
                                             postgresql_ops={'embedding': 'vector_cosine_ops'})
 
-        page_index_model_list[collection_id] = PageIndexModel
+        page_index_model_list[collection_id] = _PageIndexModel
 
-        return PageIndexModel
+        return _PageIndexModel
 
 class PageIndexHelper:
     columns = [