diff --git a/app/widget/viewer/viewer.cpp b/app/widget/viewer/viewer.cpp
index 1b023cefb..18d086386 100644
--- a/app/widget/viewer/viewer.cpp
+++ b/app/widget/viewer/viewer.cpp
@@ -1048,7 +1048,7 @@ int ViewerWidget::DeterminePlaybackQueueSize()
     end_ts = 0;
   }
 
-  int remaining_frames = (end_ts - GetTimestamp()) / playback_speed_;
+  int remaining_frames = (end_ts - GetTimestamp() - 1) / playback_speed_;
 
   // Generate maximum queue
   int max_frames = qCeil(kVideoPlaybackInterval.toDouble() / timebase().toDouble());