diff --git a/lib/plugin/pl_player/controller.dart b/lib/plugin/pl_player/controller.dart
index c60fe5d7d..f3585ab8b 100644
--- a/lib/plugin/pl_player/controller.dart
+++ b/lib/plugin/pl_player/controller.dart
@@ -839,7 +839,8 @@ class PlPlayerController {
     await _videoPlayerController?.setRate(speed);
     try {
       DanmakuOption currentOption = danmakuController!.option;
-      defaultDuration ??= currentOption.duration.toDouble();
+      defaultDuration ??=
+          currentOption.duration.toDouble() * _playbackSpeed.value;
       DanmakuOption updatedOption =
           currentOption.copyWith(duration: defaultDuration! ~/ speed);
       danmakuController!.updateOption(updatedOption);