diff --git a/tests/test_booster/test_mixed_precision/test_fp16_torch.py b/tests/test_booster/test_mixed_precision/test_fp16_torch.py
index 3fd6b7df1..f6d6e8303 100644
--- a/tests/test_booster/test_mixed_precision/test_fp16_torch.py
+++ b/tests/test_booster/test_mixed_precision/test_fp16_torch.py
@@ -34,6 +34,7 @@ def run_torch_amp(rank, world_size, port):
         optimizer.step()
         del model, optimizer, criterion, data, output, mixed_precision
 
+
 @rerun_if_address_is_in_use()
 def test_torch_ddp_plugin():
     spawn(run_torch_amp, 1)