diff --git a/libs/langchain/langchain/retrievers/google_vertex_ai_search.py b/libs/langchain/langchain/retrievers/google_vertex_ai_search.py
index 8dc8cd6d8b9..0e0c165c53e 100644
--- a/libs/langchain/langchain/retrievers/google_vertex_ai_search.py
+++ b/libs/langchain/langchain/retrievers/google_vertex_ai_search.py
@@ -160,6 +160,7 @@ class _BaseGoogleVertexAISearchRetriever(BaseModel):
         from google.protobuf.json_format import MessageToDict
 
         documents: List[Document] = []
+        chunk_type = "extractive_answers"
 
         for result in results:
             document_dict = MessageToDict(