diff --git a/examples/benchmarks/LSTM/workflow_config_lstm_Alpha158.yaml b/examples/benchmarks/LSTM/workflow_config_lstm_Alpha158.yaml
index eedff35a6..15fa20ec3 100755
--- a/examples/benchmarks/LSTM/workflow_config_lstm_Alpha158.yaml
+++ b/examples/benchmarks/LSTM/workflow_config_lstm_Alpha158.yaml
@@ -64,7 +64,6 @@ task:
             loss: mse
             n_jobs: 20
             GPU: 0
-            rnn_type: GRU
     dataset:
         class: TSDatasetH
         module_path: qlib.data.dataset