diff --git a/libs/community/langchain_community/vectorstores/pgvector.py b/libs/community/langchain_community/vectorstores/pgvector.py
index 7a8a49bc48d..6a48ec294d6 100644
--- a/libs/community/langchain_community/vectorstores/pgvector.py
+++ b/libs/community/langchain_community/vectorstores/pgvector.py
@@ -733,7 +733,7 @@ class PGVector(VectorStore):
             if operator in {"$in"}:
                 return queried_field.in_([str(val) for val in filter_value])
             elif operator in {"$nin"}:
-                return queried_field.nin_([str(val) for val in filter_value])
+                return queried_field.not_in([str(val) for val in filter_value])
             elif operator in {"$like"}:
                 return queried_field.like(filter_value)
             elif operator in {"$ilike"}: