diff --git a/freqtrade/data/btanalysis.py b/freqtrade/data/btanalysis.py
index 4505ea52a..a96e43dff 100644
--- a/freqtrade/data/btanalysis.py
+++ b/freqtrade/data/btanalysis.py
@@ -213,7 +213,7 @@ def calculate_max_drawdown(trades: pd.DataFrame, *, date_col: str = 'close_time'
     """
     if len(trades) == 0:
         raise ValueError("Trade dataframe empty.")
-    profit_results = trades.sort_values(date_col)
+    profit_results = trades.sort_values(date_col).reset_index()
     max_drawdown_df = pd.DataFrame()
     max_drawdown_df['cumulative'] = profit_results[value_col].cumsum()
     max_drawdown_df['high_value'] = max_drawdown_df['cumulative'].cummax()