diff --git a/freqtrade/optimize/backtesting.py b/freqtrade/optimize/backtesting.py
index 955b9e614..0144d934b 100644
--- a/freqtrade/optimize/backtesting.py
+++ b/freqtrade/optimize/backtesting.py
@@ -192,8 +192,8 @@ class Backtesting:
         # Create dict with data
         for pair, pair_data in processed.items():
             if not pair_data.empty:
-              pair_data.loc[:, 'buy'] = 0  # cleanup if buy_signal is exist
-              pair_data.loc[:, 'sell'] = 0  # cleanup if sell_signal is exist
+                pair_data.loc[:, 'buy'] = 0  # cleanup if buy_signal is exist
+                pair_data.loc[:, 'sell'] = 0  # cleanup if sell_signal is exist
 
             df_analyzed = self.strategy.advise_sell(
                 self.strategy.advise_buy(pair_data, {'pair': pair}), {'pair': pair})[headers].copy()