diff --git a/src/backend/langflow/interface/custom/constants.py b/src/backend/langflow/interface/custom/constants.py
index a001e9091..0a5809d5d 100644
--- a/src/backend/langflow/interface/custom/constants.py
+++ b/src/backend/langflow/interface/custom/constants.py
@@ -20,6 +20,7 @@ LANGCHAIN_BASE_TYPES = {
     "VectorStore": VectorStore,
     "Embeddings": Embeddings,
     "BaseRetriever": BaseRetriever,
+    "str": str,
 }