diff --git a/libs/langchain/langchain/vectorstores/opensearch_vector_search.py b/libs/langchain/langchain/vectorstores/opensearch_vector_search.py
index 81d58f8a8a2..711aa67e0dc 100644
--- a/libs/langchain/langchain/vectorstores/opensearch_vector_search.py
+++ b/libs/langchain/langchain/vectorstores/opensearch_vector_search.py
@@ -414,7 +414,7 @@ class OpenSearchVectorSearch(VectorStore):
             metadatas=metadatas,
             ids=ids,
             bulk_size=bulk_size,
-            kwargs=kwargs,
+            **kwargs,
         )
 
     def add_embeddings(
@@ -451,7 +451,7 @@ class OpenSearchVectorSearch(VectorStore):
             metadatas=metadatas,
             ids=ids,
             bulk_size=bulk_size,
-            kwargs=kwargs,
+            **kwargs,
         )
 
     def similarity_search(