diff --git a/libavformat/mov.c b/libavformat/mov.c
index be4291c0da..50fbcd1f9b 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -8820,7 +8820,7 @@ static void mov_read_chapters(AVFormatContext *s)
 
         if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
             st->disposition |= AV_DISPOSITION_ATTACHED_PIC | AV_DISPOSITION_TIMED_THUMBNAILS;
-            if (sti->nb_index_entries) {
+            if (!st->attached_pic.data && sti->nb_index_entries) {
                 // Retrieve the first frame, if possible
                 AVIndexEntry *sample = &sti->index_entries[0];
                 if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {