diff --git a/freqtrade/optimize/optimize_reports.py b/freqtrade/optimize/optimize_reports.py
index 4265ca70d..f870bd1f5 100644
--- a/freqtrade/optimize/optimize_reports.py
+++ b/freqtrade/optimize/optimize_reports.py
@@ -45,6 +45,7 @@ def store_backtest_stats(recordfilename: Path, stats: Dict[str, DataFrame]) -> N
     latest_filename = Path.joinpath(filename.parent, LAST_BT_RESULT_FN)
     file_dump_json(latest_filename, {'latest_backtest': str(filename.name)})
 
+
 def store_backtest_signal_candles(recordfilename: Path, candles: Dict[str, Dict]) -> None:
     """
     Stores backtest trade signal candles
@@ -65,6 +66,7 @@ def store_backtest_signal_candles(recordfilename: Path, candles: Dict[str, Dict]
     with open(filename, 'wb') as f:
         pickle.dump(candles, f)
 
+
 def _get_line_floatfmt(stake_currency: str) -> List[str]:
     """
     Generate floatformat (goes in line with _generate_result_line())