diff --git a/flepimop/gempyor_pkg/tests/parameters/test_parameters_class.py b/flepimop/gempyor_pkg/tests/parameters/test_parameters_class.py
index f82cf2a27..9801a6193 100644
--- a/flepimop/gempyor_pkg/tests/parameters/test_parameters_class.py
+++ b/flepimop/gempyor_pkg/tests/parameters/test_parameters_class.py
@@ -283,7 +283,7 @@ def test_timeseries_parameter_has_insufficient_dates_value_error(
             ValueError,
             match=(
                 f"Issue loading file '{tmp_file}' for parameter 'sigma': "
-                f"Provided file dates span '{timeseries_start_date}( 00\:00\:00)?' to '{timeseries_end_date}( 00\:00\:00)?', "
+                f"Provided file dates span '{timeseries_start_date}( 00:00:00)?' to '{timeseries_end_date}( 00:00:00)?', "
                 f"but the config dates span '{mock_inputs.ti}' to '{mock_inputs.tf}'.$"
             ),
         ):