diff --git a/examples/highfreq/workflow_config_High_Freq_Tree_Alpha158.yaml b/examples/highfreq/workflow_config_High_Freq_Tree_Alpha158.yaml
index 93d9dde56..45c59c670 100644
--- a/examples/highfreq/workflow_config_High_Freq_Tree_Alpha158.yaml
+++ b/examples/highfreq/workflow_config_High_Freq_Tree_Alpha158.yaml
@@ -59,7 +59,7 @@ task:
     record: 
         - class: "SignalRecord"
           module_path: "qlib.workflow.record_temp"
-          kwargs: 
+          kwargs: {}
         - class: "HFSignalRecord"
           module_path: "qlib.workflow.record_temp"
           kwargs: {}
\ No newline at end of file