diff --git a/source/funkin/ui/debug/charting/toolboxes/ChartEditorOffsetsToolbox.hx b/source/funkin/ui/debug/charting/toolboxes/ChartEditorOffsetsToolbox.hx
index af1d75444..46721edfa 100644
--- a/source/funkin/ui/debug/charting/toolboxes/ChartEditorOffsetsToolbox.hx
+++ b/source/funkin/ui/debug/charting/toolboxes/ChartEditorOffsetsToolbox.hx
@@ -272,19 +272,19 @@ class ChartEditorOffsetsToolbox extends ChartEditorBaseToolbox
     // waveformPlayer.waveform.forceUpdate = true;
     waveformPlayer.waveform.waveformData = playerVoice?.waveformData;
     // Set the width and duration to render the full waveform, with the clipRect applied we only render a segment of it.
-    waveformPlayer.waveform.duration = (playerVoice?.length ?? 1000) / Constants.MS_PER_SEC;
+    waveformPlayer.waveform.duration = (playerVoice?.length ?? 1000.0) / Constants.MS_PER_SEC;
 
     // Build opponent waveform.
     // waveformOpponent.waveform.forceUpdate = true;
     // note: if song only has one set of vocals (Vocals.ogg/mp3) then this is null and crashes charting editor
     // so we null check
     waveformOpponent.waveform.waveformData = opponentVoice?.waveformData;
-    waveformOpponent.waveform.duration = (opponentVoice?.length ?? 1000) / Constants.MS_PER_SEC;
+    waveformOpponent.waveform.duration = (opponentVoice?.length ?? 1000.0) / Constants.MS_PER_SEC;
 
     // Build instrumental waveform.
     // waveformInstrumental.waveform.forceUpdate = true;
     waveformInstrumental.waveform.waveformData = chartEditorState.audioInstTrack.waveformData;
-    waveformInstrumental.waveform.duration = (instTrack?.length ?? 1000) / Constants.MS_PER_SEC;
+    waveformInstrumental.waveform.duration = (instTrack?.length ?? 1000.0) / Constants.MS_PER_SEC;
 
     addOffsetsToAudioPreview();
   }