diff --git a/xinference/model/audio/core.py b/xinference/model/audio/core.py
index b5ad532b6a..39d87df956 100644
--- a/xinference/model/audio/core.py
+++ b/xinference/model/audio/core.py
@@ -25,9 +25,9 @@
 from .f5tts_mlx import F5TTSMLXModel
 from .fish_speech import FishSpeechModel
 from .funasr import FunASRModel
+from .melotts import MeloTTSModel
 from .whisper import WhisperModel
 from .whisper_mlx import WhisperMLXModel
-from .melotts import MeloTTSModel
 
 logger = logging.getLogger(__name__)
 
diff --git a/xinference/model/audio/melotts.py b/xinference/model/audio/melotts.py
index 06282cb992..bf1126fc76 100644
--- a/xinference/model/audio/melotts.py
+++ b/xinference/model/audio/melotts.py
@@ -53,6 +53,7 @@ def load(self):
 
         import os
         import sys
+
         import nltk
 
         # English language requires download averaged_perceptron_tagger_eng