diff --git a/libavformat/webvttdec.c b/libavformat/webvttdec.c
index 6e60348764..6feda1585e 100644
--- a/libavformat/webvttdec.c
+++ b/libavformat/webvttdec.c
@@ -216,7 +216,8 @@ static const AVClass webvtt_demuxer_class = {
 const FFInputFormat ff_webvtt_demuxer = {
     .p.name         = "webvtt",
     .p.long_name    = NULL_IF_CONFIG_SMALL("WebVTT subtitle"),
-    .p.extensions   = "vtt",
+    .p.mime_type    = "text/vtt",
+    .p.extensions   = "vtt,webvtt",
     .p.priv_class   = &webvtt_demuxer_class,
     .priv_data_size = sizeof(WebVTTContext),
     .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,