diff --git a/python_apps/pypo/pypo/mime.types b/python_apps/pypo/pypo/mime.types
index 9f05f6b44..4cea7b21c 100644
--- a/python_apps/pypo/pypo/mime.types
+++ b/python_apps/pypo/pypo/mime.types
@@ -7,7 +7,7 @@ audio/mpeg3         mp3
 audio/x-aac         aac
 audio/aac           aac
 audio/aacp          aac
-audio/mp4           mp4
+audio/mp4           m4a
 audio/x-flac        flac
 audio/wav           wav
 audio/x-wav         wav