diff --git a/src/aeros_simulation/router.py b/src/aeros_simulation/router.py
index ec8af0c..1c96700 100644
--- a/src/aeros_simulation/router.py
+++ b/src/aeros_simulation/router.py
@@ -48,7 +48,7 @@ active_simulations = {}
 
 
 @router.get("", response_model=StandardResponse[SimulationPagination])
-async def get_all_simulation(db_session: DbSession, common: CommonParameters, status: Optional(str) = Query(None)):
+async def get_all_simulation(db_session: DbSession, common: CommonParameters, status: Optional[str] = Query(None)):
     """Get all simulation."""
 
     results = await get_all(common, status)