diff --git a/backend/engine/engine.py b/backend/engine/engine.py
index 101f6ada..8f6eca3f 100644
--- a/backend/engine/engine.py
+++ b/backend/engine/engine.py
@@ -1182,9 +1182,7 @@ async def model_engine(body: PlanTriggerRequest):
                 )
 
             # Add best practice measures (ventilation/trickle vents) - pass needs_ventilation flag
-            selected = optimiser_functions.add_best_practice_measures(
-                p.id, solution, recommendations, selected, needs_ventilation
-            )
+            selected = optimiser_functions.add_best_practice_measures(p.id, solution, recommendations, selected)
             # Final flattening - we pass what the battery SAP score would be, regardless if the battery was selected
             recommendations[p.id] = optimiser_functions.flatten_recommendations_with_defaults(
                 p.id, recommendations, selected, battery_sap_score