diff --git a/changelog.md b/changelog.md
index 4c8fbf3e..c7830c94 100644
--- a/changelog.md
+++ b/changelog.md
@@ -26,6 +26,7 @@ Saves from 8.x are not compatible with 9.0.0.
 * **[UI]** Fixed flight properties UI to support F-15E S4+ laser codes.
 * **[UI]** In unit transfer dialog, only list control points that are reachable from the control point units are being transferred from.
 * **[UI]** Fixed UI bug where altering an "ahead of package" TOT offset would change the offset back to a "behind pacakge" offset.
+* **[UI]** Fixed bug where changing TOT offsets could result in flight startup times that are in the past.
 
 # 8.1.0
 
diff --git a/qt_ui/windows/mission/flight/settings/FlightPlanPropertiesGroup.py b/qt_ui/windows/mission/flight/settings/FlightPlanPropertiesGroup.py
index 96b63a36..75ea97d1 100644
--- a/qt_ui/windows/mission/flight/settings/FlightPlanPropertiesGroup.py
+++ b/qt_ui/windows/mission/flight/settings/FlightPlanPropertiesGroup.py
@@ -119,8 +119,10 @@ class FlightPlanPropertiesGroup(QGroupBox):
         if self.negative_offset_checkbox.isChecked():
             offset = -offset
         self.flight.flight_plan.tot_offset = offset
+        self.package_model.update_tot()
         self.update_departure_time()
 
     def toggle_negative_offset(self) -> None:
         self.flight.flight_plan.tot_offset = -self.flight.flight_plan.tot_offset
+        self.package_model.update_tot()
         self.update_departure_time()