diff --git a/src/components/bookings/BookingDetailPanel.tsx b/src/components/bookings/BookingDetailPanel.tsx
index da2a249..bec3e67 100644
--- a/src/components/bookings/BookingDetailPanel.tsx
+++ b/src/components/bookings/BookingDetailPanel.tsx
@@ -604,6 +604,7 @@ export function BookingDetailPanel({ booking, room, rooms, allBookings, slug, on
                         className="input text-sm"
                         value={earlyNewCheckOut}
                         min={today}
+                        max={booking.checkOut}
                         onChange={e => setEarlyNewCheckOut(e.target.value)}
                       />
                     </div>