diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index d5bc9230bb..22108adc99 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -2560,7 +2560,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
         tracks[i].audio.buf_timecode   = AV_NOPTS_VALUE;
         tracks[i].end_timecode         = 0;
         if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE &&
-            !tracks[i].stream->discard != AVDISCARD_ALL) {
+            tracks[i].stream->discard != AVDISCARD_ALL) {
             index_sub = av_index_search_timestamp(
                 tracks[i].stream, st->index_entries[index].timestamp,
                 AVSEEK_FLAG_BACKWARD);