diff --git a/boot/boot.js b/boot/boot.js
index 6bfa6495a..c64b881f4 100644
--- a/boot/boot.js
+++ b/boot/boot.js
@@ -2403,11 +2403,11 @@ $tw.boot.initStartup = function(options) {
 	$tw.utils.registerFileType("application/x-font-ttf","base64",".woff");
 	$tw.utils.registerFileType("application/font-woff2","base64",".woff2");
 	$tw.utils.registerFileType("audio/ogg","base64",".ogg");
+	$tw.utils.registerFileType("audio/mp4","base64",[".mp4",".m4a"]);
 	$tw.utils.registerFileType("video/ogg","base64",[".ogm",".ogv",".ogg"]);
 	$tw.utils.registerFileType("video/webm","base64",".webm");
 	$tw.utils.registerFileType("video/mp4","base64",".mp4");
 	$tw.utils.registerFileType("audio/mp3","base64",".mp3");
-	$tw.utils.registerFileType("audio/mp4","base64",[".mp4",".m4a"]);
 	$tw.utils.registerFileType("text/markdown","utf8",[".md",".markdown"],{deserializerType:"text/x-markdown"});
 	$tw.utils.registerFileType("text/x-markdown","utf8",[".md",".markdown"]);
 	$tw.utils.registerFileType("application/enex+xml","utf8",".enex");