diff --git a/libavformat/4xm.c b/libavformat/4xm.c
index f003c9c25a..7a87c3695a 100644
--- a/libavformat/4xm.c
+++ b/libavformat/4xm.c
@@ -131,6 +131,8 @@ static int parse_strk(AVFormatContext *s,
         return AVERROR_INVALIDDATA;
 
     track = AV_RL32(buf + 8);
+    if (track < 0)
+        return AVERROR_INVALIDDATA;
     if (track + 1 > fourxm->track_count) {
         if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack)))
             return AVERROR(ENOMEM);