diff --git a/libavcodec/tdsc.c b/libavcodec/tdsc.c
index 985ed405fc..88ff575f99 100644
--- a/libavcodec/tdsc.c
+++ b/libavcodec/tdsc.c
@@ -403,7 +403,7 @@ static int tdsc_decode_tiles(AVCodecContext *avctx, int number_tiles)
         }
 
         tile_size = bytestream2_get_le32(&ctx->gbc);
-        if (bytestream2_get_bytes_left(&ctx->gbc) < tile_size)
+        if (bytestream2_get_bytes_left(&ctx->gbc) < tile_size + 24LL)
             return AVERROR_INVALIDDATA;
 
         tile_mode = bytestream2_get_le32(&ctx->gbc);