diff --git a/admin/dashboard/blueprints/contacts.py b/admin/dashboard/blueprints/contacts.py
index f6cfb34..3eb587a 100644
--- a/admin/dashboard/blueprints/contacts.py
+++ b/admin/dashboard/blueprints/contacts.py
@@ -267,7 +267,7 @@ def api_send_message():
                 return jsonify({'success': False, 'message': '未上传文件'})
             file = request.files['file']
             client_msg_id, create_time, new_msg_id = loop.run_until_complete(
-                server.client.send_voice_message(wxid, file.read())
+                server.client.send_voice_message(wxid, file.read(), format="MP3")
             )
             return jsonify({
                 'success': True,