diff --git a/libavformat/mov.c b/libavformat/mov.c
index c3d857be4d..e1f2db28d9 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1724,6 +1724,10 @@ static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 
         sample_count=avio_rb32(pb);
         sample_duration = avio_rb32(pb);
+        if (sample_count < 0) {
+            av_log(c->fc, AV_LOG_ERROR, "Invalid sample_count=%d\n", sample_count);
+            return AVERROR_INVALIDDATA;
+        }
         sc->stts_data[i].count= sample_count;
         sc->stts_data[i].duration= sample_duration;