diff --git a/tests/unit_tests/test_deplete_integrator.py b/tests/unit_tests/test_deplete_integrator.py
index 8cade45b14..c90d7122d1 100644
--- a/tests/unit_tests/test_deplete_integrator.py
+++ b/tests/unit_tests/test_deplete_integrator.py
@@ -75,8 +75,8 @@ def test_results_save(run_in_tmpdir):
 
     op_result1 = [OperatorResult(k, rates) for k, rates in zip(eigvl1, rate1)]
     op_result2 = [OperatorResult(k, rates) for k, rates in zip(eigvl2, rate2)]
-    Results.save(op, x1, op_result1, t1, 0, 0)
-    Results.save(op, x2, op_result2, t2, 0, 1)
+    Results.save(op, x1, op_result1, t1, 0, 0, None)
+    Results.save(op, x2, op_result2, t2, 0, 1, None)
 
     # Load the files
     res = ResultsList("depletion_results.h5")