diff --git a/apps/i2psnark/mime.properties b/apps/i2psnark/mime.properties
index b251fb72e..6739efc49 100644
--- a/apps/i2psnark/mime.properties
+++ b/apps/i2psnark/mime.properties
@@ -9,6 +9,7 @@ flac	= audio/flac
 flv	= video/x-flv
 iso	= application/x-iso9660-image
 m4a	= audio/mp4a-latm
+m4b	= audio/mp4a-latm
 m4v	= video/x-m4v
 mkv	= video/x-matroska
 mobi	= application/x-mobipocket-ebook