diff --git a/libavformat/riff.c b/libavformat/riff.c
index 1ccd9091be..a834084b71 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -287,6 +287,7 @@ const AVCodecTag ff_codec_wav_tags[] = {
     { CODEC_ID_ADPCM_YAMAHA,    0x0020 },
     { CODEC_ID_TRUESPEECH,      0x0022 },
     { CODEC_ID_GSM_MS,          0x0031 },
+    { CODEC_ID_AMR_NB,          0x0038 },  /* rogue format number */
     { CODEC_ID_ADPCM_G726,      0x0045 },
     { CODEC_ID_MP2,             0x0050 },
     { CODEC_ID_MP3,             0x0055 },