diff --git a/NotEnoughAV1Encodes/MainWindow.xaml.cs b/NotEnoughAV1Encodes/MainWindow.xaml.cs
index 27ac3c3..9a9c0f5 100644
--- a/NotEnoughAV1Encodes/MainWindow.xaml.cs
+++ b/NotEnoughAV1Encodes/MainWindow.xaml.cs
@@ -389,7 +389,8 @@ private void ButtonSetDestination_Click(object sender, RoutedEventArgs e)
                 videoDB.OutputFileName = Path.GetFileName(videoDB.OutputPath);
                 try
                 {
-                    if (Path.GetExtension(videoDB.OutputPath).ToLower() == ".mp4")
+                    if (Path.GetExtension(videoDB.OutputPath).ToLower() == ".mp4" || 
+                        Path.GetExtension(videoDB.OutputPath).ToLower() == ".webm")
                     {
                         // Disable Subtitles if Output is MP4
                         foreach (Subtitle.SubtitleTracks subtitleTracks in ListBoxSubtitleTracks.Items)