diff --git a/paddlespeech/server/engine/tts/online/onnx/tts_engine.py b/paddlespeech/server/engine/tts/online/onnx/tts_engine.py
index b52a3bc52..a37e42164 100644
--- a/paddlespeech/server/engine/tts/online/onnx/tts_engine.py
+++ b/paddlespeech/server/engine/tts/online/onnx/tts_engine.py
@@ -164,7 +164,7 @@ class TTSServerExecutor(TTSExecutor):
         if lang == 'zh':
             self.frontend = Frontend(
                 phone_vocab_path=self.phones_dict,
-                tone_vocab_path=self.tones_dict
+                tone_vocab_path=self.tones_dict,
                 g2p_model='pypinyin')
 
         elif lang == 'en':