diff --git a/libavformat/isom.c b/libavformat/isom.c
index d33d93ac56..b0923c40cf 100644
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@@ -285,6 +285,7 @@ const AVCodecTag ff_codec_movaudio_tags[] = {
     { AV_CODEC_ID_QDM2,            MKTAG('Q', 'D', 'M', '2') },
     { AV_CODEC_ID_QDMC,            MKTAG('Q', 'D', 'M', 'C') },
     { AV_CODEC_ID_SPEEX,           MKTAG('s', 'p', 'e', 'x') }, /* Flash Media Server */
+    { AV_CODEC_ID_SPEEX,           MKTAG('S', 'P', 'X', 'N') }, /* ZygoAudio (quality 10 mode) */
     { AV_CODEC_ID_WMAV2,           MKTAG('W', 'M', 'A', '2') },
     { AV_CODEC_ID_NONE, 0 },
 };