diff --git a/src/preloadjs/utils/RequestUtils.js b/src/preloadjs/utils/RequestUtils.js
index 69200c2..87a2136 100644
--- a/src/preloadjs/utils/RequestUtils.js
+++ b/src/preloadjs/utils/RequestUtils.js
@@ -108,6 +108,7 @@
 			case "ogg":
 			case "mp3":
 			case "webm":
+			case "aac":
 				return createjs.Types.SOUND;
 			case "mp4":
 			case "webm":