diff --git a/src/calculation_time_constrains/service.py b/src/calculation_time_constrains/service.py
index e8e6fdd..e0a40ac 100644
--- a/src/calculation_time_constrains/service.py
+++ b/src/calculation_time_constrains/service.py
@@ -1220,6 +1220,7 @@ class OptimumCostModel:
                 location_tag = equipment.location_tag
                 cost_per_failure = equipment.material_cost
                 overhaul_cost = equipment.overhaul_cost
+                service_cost = equipment.service_cost
 
                 # Get pre-fetched reliability data
                 failure_rate = all_reliabilities.get(location_tag, {})
@@ -1227,7 +1228,7 @@ class OptimumCostModel:
 
                 # Calculate costs using vectorized operations
                 predicted_costs = self._calculate_costs_vectorized(
-                    preventive_cost=preventive_cost_per_equipment,
+                    preventive_cost=overhaul_cost + service_cost,
                     failure_replacement_cost=cost_per_failure,
                     failure_rate=failure_rate
                 )