diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index 7756d0d7b7..25dfba55ae 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -1143,7 +1143,7 @@ leave:
     if (last != orig_size + 11 && last != orig_size + 10 &&
         (last != orig_size || !last) && last != flv->sum_flv_tag_size &&
         !flv->broken_sizes) {
-        av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d\n", last, orig_size + 11);
+        av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d %d\n", last, orig_size + 11, flv->sum_flv_tag_size);
         avio_seek(s->pb, pos + 1, SEEK_SET);
         ret = resync(s);
         av_packet_unref(pkt);