diff --git a/TwitchDownloaderCore/Tools/FfmpegConcatList.cs b/TwitchDownloaderCore/Tools/FfmpegConcatList.cs
index 38027745..e8c3b37d 100644
--- a/TwitchDownloaderCore/Tools/FfmpegConcatList.cs
+++ b/TwitchDownloaderCore/Tools/FfmpegConcatList.cs
@@ -32,7 +32,7 @@ public static async Task SerializeAsync(string filePath, M3U8 playlist, Range vi
                 await sw.WriteLineAsync("stream");
                 await sw.WriteLineAsync("exact_stream_id 0x101"); // Video
                 await sw.WriteLineAsync("stream");
-                await sw.WriteLineAsync("exact_stream_id 0x102?"); // Subtitle
+                await sw.WriteLineAsync("exact_stream_id 0x102"); // Subtitle
 
                 await sw.WriteAsync("duration ");
                 await sw.WriteLineAsync(stream.PartInfo.Duration.ToString(CultureInfo.InvariantCulture));