diff --git a/MediaBrowser.Providers/Subtitles/SubtitleManager.cs b/MediaBrowser.Providers/Subtitles/SubtitleManager.cs
index 6821e55aab..e51826f0ec 100644
--- a/MediaBrowser.Providers/Subtitles/SubtitleManager.cs
+++ b/MediaBrowser.Providers/Subtitles/SubtitleManager.cs
@@ -239,7 +239,8 @@ namespace MediaBrowser.Providers.Subtitles
 
         private async Task TrySaveToFiles(Stream stream, List<string> savePaths, Video video, string extension)
         {
-            if (!_allowedSubtitleFormats.Contains("." + extension, StringComparison.OrdinalIgnoreCase))
+            if (!_allowedSubtitleFormats.Contains("." + extension, StringComparison.OrdinalIgnoreCase)
+                    && !_allowedSubtitleFormats.Contains(extension, StringComparison.OrdinalIgnoreCase))
             {
                 throw new ArgumentException($"Invalid subtitle format: {extension}");
             }