--- a/netwerk/mime/nsMimeTypes.h
+++ b/netwerk/mime/nsMimeTypes.h
@@ -83,17 +83,16 @@
 #define AUDIO_MP3                           "audio/mpeg"
 #define AUDIO_MP4                           "audio/mp4"
 #define AUDIO_AMR                           "audio/amr"
 #define AUDIO_FLAC                          "audio/flac"
 #define AUDIO_3GPP                          "audio/3gpp"
 #define AUDIO_3GPP2                         "audio/3gpp2"
 #define AUDIO_MIDI                          "audio/x-midi"
 #define AUDIO_MATROSKA                      "audio/x-matroska"
-#define AUDIO_FLAC                          "audio/flac"
 
 #define BINARY_OCTET_STREAM                 "binary/octet-stream"
 
 #define IMAGE_GIF                           "image/gif"
 #define IMAGE_JPEG                          "image/jpeg"
 #define IMAGE_JPG                           "image/jpg"
 #define IMAGE_PJPEG                         "image/pjpeg"
 #define IMAGE_PNG                           "image/png"