diff --git a/tests/worker/jobs/step_run_mock_job.py b/tests/worker/jobs/step_run_mock_job.py
index 95ab7960..0c82d7c2 100644
--- a/tests/worker/jobs/step_run_mock_job.py
+++ b/tests/worker/jobs/step_run_mock_job.py
@@ -33,4 +33,4 @@ def set_simulation_step_duration(self, simulation_step_duration):
 
     @message
     def advance(self):
-        self.run.sim_time = self.run.sim_time + 1
+        self.run.sim_time = self.run.sim_time + self.options.timestep_duration