diff --git a/tests/optimize/test_hyperopt.py b/tests/optimize/test_hyperopt.py
index d7ab20ee5..cf6faa0b9 100644
--- a/tests/optimize/test_hyperopt.py
+++ b/tests/optimize/test_hyperopt.py
@@ -8,6 +8,7 @@ import pandas as pd
 import pytest
 from arrow import Arrow
 from filelock import Timeout
+from skopt.space import Integer
 
 from freqtrade.commands.optimize_commands import setup_optimize_configuration, start_hyperopt
 from freqtrade.data.history import load_data
@@ -1041,6 +1042,8 @@ def test_max_open_trades_consistency(mocker, hyperopt_conf, tmpdir, fee) -> None
 
     assert isinstance(hyperopt.custom_hyperopt, HyperOptAuto)
 
+    hyperopt.custom_hyperopt.trades_space = lambda: [Integer(1, 10, name='max_open_trades')]
+
     first_time_evaluated = False
 
     def stake_amount_interceptor(func):