diff --git a/backend/open_webui/routers/audio.py b/backend/open_webui/routers/audio.py
index ffb949fea..f29a65358 100644
--- a/backend/open_webui/routers/audio.py
+++ b/backend/open_webui/routers/audio.py
@@ -83,6 +83,8 @@ def audio_needs_conversion(file_path):
         return "mp4"
     elif info.get("format_name") == "ogg":
         return "ogg"
+    elif info.get("format_name") == "matroska,webm":
+        return "webm"
     return None