diff --git a/backend/rag_components/chain_links/rag_basic.py b/backend/rag_components/chain_links/rag_basic.py
index 569a9fc..96de7d5 100644
--- a/backend/rag_components/chain_links/rag_basic.py
+++ b/backend/rag_components/chain_links/rag_basic.py
@@ -28,7 +28,7 @@ def rag_basic(llm, retriever: BaseRetriever) -> DocumentedRunnable:
     chain = (
         {
             "relevant_documents": fetch_docs_chain(retriever),
-            "question": RunnablePassthrough(Question),
+            "question": RunnablePassthrough(input_type=Question),
         }
         | ChatPromptTemplate.from_template(prompt)
         | llm