diff --git a/tests/test_scripts/test_solph/test_multi_period_model/test_multi_period_investment_model.py b/tests/test_scripts/test_solph/test_multi_period_model/test_multi_period_investment_model.py
index e0a8e6ca7..d5714275f 100644
--- a/tests/test_scripts/test_solph/test_multi_period_model/test_multi_period_investment_model.py
+++ b/tests/test_scripts/test_solph/test_multi_period_model/test_multi_period_investment_model.py
@@ -242,7 +242,6 @@ def test_multi_period_investment_model(solver="cbc"):
                 )
             },
             loss_rate=0,
-            initial_storage_level=0,
             max_storage_level=1,
             min_storage_level=0,
             inflow_conversion_factor=1,