diff --git a/src/calculation_time_constrains/service.py b/src/calculation_time_constrains/service.py
index 32985d0..c1e0123 100644
--- a/src/calculation_time_constrains/service.py
+++ b/src/calculation_time_constrains/service.py
@@ -112,7 +112,7 @@ async def get_calculation_data_by_id(db_session: DbSession, calculation_id) -> C
     return result.unique().scalar()
 
 
-async def create_calculation_result_service(db_session: DbSession, calculation_id: UUID, costPerFailure: Optional[float]):
+async def create_calculation_result_service(db_session: DbSession, calculation_id: UUID, costPerFailure: Optional[float] = None):
     days = 60
     calculation = await get_calculation_data_by_id(db_session=db_session, calculation_id=calculation_id)
     reference = calculation.reference_id if calculation.overhaul_reference_type == OverhaulReferenceType.ASSET else await get(db_session=db_session, scope_id=calculation.reference_id)