diff --git a/src/N_m3u8DL-RE/CommandLine/CommandInvoker.cs b/src/N_m3u8DL-RE/CommandLine/CommandInvoker.cs
index ad29253..0530a4a 100644
--- a/src/N_m3u8DL-RE/CommandLine/CommandInvoker.cs
+++ b/src/N_m3u8DL-RE/CommandLine/CommandInvoker.cs
@@ -34,7 +34,7 @@ namespace N_m3u8DL_RE.CommandLine
         private readonly static Option<string> KeyTextFile = new(new string[] { "--key-text-file" }, description: ResString.cmd_keyText);
         private readonly static Option<Dictionary<string, string>> Headers = new(new string[] { "-H", "--header" }, description: ResString.cmd_header, parseArgument: ParseHeaders) { Arity = ArgumentArity.OneOrMore, AllowMultipleArgumentsPerToken = false };
         private readonly static Option<LogLevel> LogLevel = new(name: "--log-level", description: ResString.cmd_logLevel, getDefaultValue: () => Common.Log.LogLevel.INFO);
-        private readonly static Option<SubtitleFormat> SubtitleFormat = new(name: "--sub-format", description: ResString.cmd_subFormat, getDefaultValue: () => Enum.SubtitleFormat.VTT);
+        private readonly static Option<SubtitleFormat> SubtitleFormat = new(name: "--sub-format", description: ResString.cmd_subFormat, getDefaultValue: () => Enum.SubtitleFormat.SRT);
         private readonly static Option<bool> AutoSelect = new(new string[] { "--auto-select" }, description: ResString.cmd_autoSelect, getDefaultValue: () => false);
         private readonly static Option<bool> SubOnly = new(new string[] { "--sub-only" }, description: ResString.cmd_subOnly, getDefaultValue: () => false);
         private readonly static Option<int> ThreadCount = new(new string[] { "--thread-count" }, description: ResString.cmd_threadCount, getDefaultValue: () => 8) { ArgumentHelpName = "number" };