diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 100b97f5dd..e45cfb02c9 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -2094,6 +2094,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
         avio_seek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
         matroska->current_id = 0;
         while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
+            matroska->prev_pkt = NULL;
             matroska_clear_queue(matroska);
             if (matroska_parse_cluster(matroska) < 0)
                 break;