diff --git a/app/cabinet/routes/admin_tickets.py b/app/cabinet/routes/admin_tickets.py
index 72e21b81..c93a370c 100644
--- a/app/cabinet/routes/admin_tickets.py
+++ b/app/cabinet/routes/admin_tickets.py
@@ -269,7 +269,7 @@ async def update_ticket_settings(
     if request.sla_reminder_cooldown_minutes is not None:
         settings.SUPPORT_TICKET_SLA_REMINDER_COOLDOWN_MINUTES = request.sla_reminder_cooldown_minutes
     if request.support_system_mode is not None:
-        settings.SUPPORT_SYSTEM_MODE = request.support_system_mode.strip().lower()
+        SupportSettingsService.set_system_mode(request.support_system_mode.strip().lower())
 
     # Update cabinet notification settings
     if request.cabinet_user_notifications_enabled is not None: