diff --git a/api/core/rag/retrieval/dataset_retrieval.py b/api/core/rag/retrieval/dataset_retrieval.py
index 6978860529..38c0b540d5 100644
--- a/api/core/rag/retrieval/dataset_retrieval.py
+++ b/api/core/rag/retrieval/dataset_retrieval.py
@@ -496,6 +496,8 @@ class DatasetRetrieval:
                     all_documents = self.calculate_keyword_score(query, all_documents, top_k)
                 elif index_type == "high_quality":
                     all_documents = self.calculate_vector_score(all_documents, top_k, score_threshold)
+                else:
+                    all_documents = all_documents[:top_k] if top_k else all_documents
 
         self._on_query(query, dataset_ids, app_id, user_from, user_id)