diff --git a/demos/streaming_asr_server/conf/application.yaml b/demos/streaming_asr_server/conf/application.yaml
index 683d86f03cdc6a9ad0cf740ef9b4d491dd5d2ac9..a89d312abfcc5d779a3d31751b373cfe8dee3624 100644
--- a/demos/streaming_asr_server/conf/application.yaml
+++ b/demos/streaming_asr_server/conf/application.yaml
@@ -28,6 +28,7 @@ asr_online:
     sample_rate: 16000
     cfg_path: 
     decode_method: 
+    num_decoding_left_chunks: -1
     force_yes: True
     device: 'cpu' # cpu or gpu:id
     decode_method: "attention_rescoring"