diff --git a/src/pyciemss/PetriNetODE/interfaces_bigbox.py b/src/pyciemss/PetriNetODE/interfaces_bigbox.py
index 62c0de675..971beef92 100644
--- a/src/pyciemss/PetriNetODE/interfaces_bigbox.py
+++ b/src/pyciemss/PetriNetODE/interfaces_bigbox.py
@@ -356,7 +356,6 @@ def qoi_fn(y):
         timepoints,
         interventions=interventions,
         time_unit=time_unit,
-        quantiles=True,
         alpha_qs=alpha_qs,
         stacking_order=stacking_order,
         observables=observables,
@@ -562,7 +561,6 @@ def qoi_fn(y):
         timepoints,
         interventions=interventions_opt,
         time_unit=time_unit,
-        quantiles=True,
         alpha_qs=alpha_qs,
         stacking_order=stacking_order,
         observables=observables,
@@ -824,7 +822,6 @@ def qoi_fn(y):
         timepoints,
         interventions=interventions_opt,
         time_unit=time_unit,
-        quantiles=True,
         alpha_qs=alpha_qs,
         stacking_order=stacking_order,
         observables=observables,