diff --git a/private_gpt/server/chat/chat_service.py b/private_gpt/server/chat/chat_service.py
index dcd0514d..ea57f2c0 100644
--- a/private_gpt/server/chat/chat_service.py
+++ b/private_gpt/server/chat/chat_service.py
@@ -109,7 +109,9 @@ class ChatService:
         settings = self.settings
         if use_context:
             vector_index_retriever = self.vector_store_component.get_retriever(
-                index=self.index, context_filter=context_filter, similarity_top_k=self.settings.rag.similarity_top_k,
+                index=self.index,
+                context_filter=context_filter,
+                similarity_top_k=self.settings.rag.similarity_top_k,
             )
             return ContextChatEngine.from_defaults(
                 system_prompt=system_prompt,