diff --git a/backend/api/Services/ActionServices/TaskDurationService.cs b/backend/api/Services/ActionServices/TaskDurationService.cs
index 019b126ed..fca6e0afc 100644
--- a/backend/api/Services/ActionServices/TaskDurationService.cs
+++ b/backend/api/Services/ActionServices/TaskDurationService.cs
@@ -58,7 +58,7 @@ private async Task UpdateAverageDuration(List<MissionRun> recentMissionRunsForMo
                             .Select(
                                 task =>
                                     (task.EndTime! - task.StartTime!).Value.TotalSeconds
-                                    - task.Inspection?.VideoDuration ?? 0
+                                    - (task.Inspection?.VideoDuration ?? 0)
                                     )
                             )
                 .ToList();