1 files changed, 1 insertions, 0 deletions

diff --git a/apps/tree.c b/apps/tree.c
index 24b5c2114c..17da91d72b 100644
--- a/apps/tree.c
+++ b/apps/tree.c
@@ -101,6 +101,7 @@ const struct filetype filetypes[] = {
     { "mpc", TREE_ATTR_MPA, Icon_Audio, VOICE_EXT_MPA },
     { "wv",  TREE_ATTR_MPA, Icon_Audio, VOICE_EXT_MPA },
     { "m4a", TREE_ATTR_MPA, Icon_Audio, VOICE_EXT_MPA },
+    { "m4b", TREE_ATTR_MPA, Icon_Audio, VOICE_EXT_MPA },
     { "mp4", TREE_ATTR_MPA, Icon_Audio, VOICE_EXT_MPA },
     { "shn", TREE_ATTR_MPA, Icon_Audio, VOICE_EXT_MPA },
     { "aif", TREE_ATTR_MPA, Icon_Audio, VOICE_EXT_MPA },