diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index efacca9c01..ce11a46a7b 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -3429,7 +3429,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
     MatroskaDemuxContext *matroska = s->priv_data;
     MatroskaTrack *tracks = NULL;
     AVStream *st = s->streams[stream_index];
-    int i, index, index_sub, index_min;
+    int i, index, index_min;
 
     /* Parse the CUES now since we need the index data to seek. */
     if (matroska->cues_parsing_deferred > 0) {