diff --git a/freqtrade/tests/optimize/test_backtesting.py b/freqtrade/tests/optimize/test_backtesting.py
index fbcbe4c55..35ed9c49e 100644
--- a/freqtrade/tests/optimize/test_backtesting.py
+++ b/freqtrade/tests/optimize/test_backtesting.py
@@ -529,10 +529,11 @@ def test_backtest(default_conf, fee, mocker) -> None:
         {'pair': [pair, pair],
          'profit_percent': [0.0, 0.0],
          'profit_abs': [0.0, 0.0],
-         'open_time': [Arrow(2018, 1, 29, 18, 40, 0).datetime,
-                       Arrow(2018, 1, 30, 3, 30, 0).datetime],
-         'close_time': [Arrow(2018, 1, 29, 22, 35, 0).datetime,
-                        Arrow(2018, 1, 30, 4, 10, 0).datetime],
+         'open_time': pd.to_datetime([Arrow(2018, 1, 29, 18, 40, 0).datetime,
+                                      Arrow(2018, 1, 30, 3, 30, 0).datetime], utc=True
+                                     ),
+         'close_time': pd.to_datetime([Arrow(2018, 1, 29, 22, 35, 0).datetime,
+                                       Arrow(2018, 1, 30, 4, 10, 0).datetime], utc=True),
          'open_index': [78, 184],
          'close_index': [125, 192],
          'trade_duration': [235, 40],