diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index fe423fbc11..b75eff73c0 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -1099,7 +1099,7 @@ AVOutputFormat ff_mpegts_muxer = {
     .name              = "mpegts",
     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
     .mime_type         = "video/x-mpegts",
-    .extensions        = "ts,m2t,m2ts",
+    .extensions        = "ts,m2t,m2ts,mts",
     .priv_data_size    = sizeof(MpegTSWrite),
     .audio_codec       = CODEC_ID_MP2,
     .video_codec       = CODEC_ID_MPEG2VIDEO,