diff --git a/paddlespeech/server/engine/engine_warmup.py b/paddlespeech/server/engine/engine_warmup.py
index b7a05cd9ee3203605adda215f8f781e13cfb225b..3751554c21339e9427f11f6dbbfb142dac2cb280 100644
--- a/paddlespeech/server/engine/engine_warmup.py
+++ b/paddlespeech/server/engine/engine_warmup.py
@@ -61,7 +61,7 @@ def warm_up(engine_and_type: str, warm_up_time: int=3) -> bool:
                 else:
                     st = time.time()
                     connection_handler.infer(
-						text=sentence,
+                        text=sentence,
                         lang=tts_engine.lang,
                         am=tts_engine.config.am)
                     et = time.time()