diff --git a/libavformat/daud.c b/libavformat/daud.c
index ca9be27905..1b3cfcf2d9 100644
--- a/libavformat/daud.c
+++ b/libavformat/daud.c
@@ -57,6 +57,11 @@ static int daud_write_header(struct AVFormatContext *s)
 
 static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
 {
+    if (pkt->size > 65535) {
+        av_log(s, AV_LOG_ERROR,
+               "Packet size too large for s302m. (%d > 65535)\n", pkt->size);
+        return -1;
+    }
     avio_wb16(s->pb, pkt->size);
     avio_wb16(s->pb, 0x8010); // unknown
     avio_write(s->pb, pkt->data, pkt->size);