diff --git a/api.py b/api.py
index d706109..e827c53 100644
--- a/api.py
+++ b/api.py
@@ -37,7 +37,7 @@ app = FastAPI(lifespan=lifespan)
 
 class Item(BaseModel):
     prompt: str = "你好"
-    history: list[tuple[str, str]] = [[]]
+    history: list[tuple[str, str]] = []
     max_length: int = 2048
     top_p: float = 0.7
     temperature: float = 0.95