diff --git a/biosimulators_copasi/data_model.py b/biosimulators_copasi/data_model.py
index 72d1dfc..04c6de1 100644
--- a/biosimulators_copasi/data_model.py
+++ b/biosimulators_copasi/data_model.py
@@ -1008,7 +1008,6 @@ def get_simulation_configuration(self) -> dict:
         problem = {
             "AutomaticStepSize": False,
             "StepNumber": self.copasi_number_of_steps,
-            #"StepSize": self._step_size,
             "Duration": self._duration_arg,
             "OutputStartTime": self.sim.output_start_time - self.init_time_offset
         }