diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index c119518967..a8f99bf4f7 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -534,6 +534,7 @@ static int mkv_write_tracks(AVFormatContext *s)
         put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER     , i + 1);
         put_ebml_uint (pb, MATROSKA_ID_TRACKUID        , i + 1);
         put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0);    // no lacing (yet)
+        put_ebml_float(pb, MATROSKA_ID_TRACKTIMECODESCALE, 1.0);
 
         if ((tag = av_metadata_get(st->metadata, "description", NULL, 0)))
             put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);