diff --git a/logstash_formatter.go b/logstash_formatter.go
index <HASH>..<HASH> 100644
--- a/logstash_formatter.go
+++ b/logstash_formatter.go
@@ -44,7 +44,8 @@ func (f *LogstashFormatter) FormatWithPrefix(entry *logrus.Entry, prefix string)
 	timeStampFormat := f.TimestampFormat
 
 	if timeStampFormat == "" {
-		timeStampFormat = logrus.DefaultTimestampFormat
+		//timeStampFormat = logrus.DefaultTimestampFormat
+		timeStampFormat = "2006-01-02 15:04:05.000"
 	}
 
 	fields["@timestamp"] = entry.Time.Format(timeStampFormat)
time format with milliseconds (#<I>)

Till the logstash hook will have a way to set time format, this change is applied.