diff --git a/src/plugins/irc-events/link.js b/src/plugins/irc-events/link.js
index 0d7d6a45..00236def 100644
--- a/src/plugins/irc-events/link.js
+++ b/src/plugins/irc-events/link.js
@@ -251,6 +251,8 @@ function parse(msg, chan, preview, res, client) {
 		case "audio/x-mpeg":
 		case "audio/x-mpeg-3":
 		case "audio/flac":
+		case "audio/x-flac":
+		case "audio/mp4":
 		case "audio/x-m4a":
 			if (!preview.link.startsWith("https://")) {
 				break;
diff --git a/src/plugins/uploader.js b/src/plugins/uploader.js
index 426f717f..44a1629a 100644
--- a/src/plugins/uploader.js
+++ b/src/plugins/uploader.js
@@ -117,6 +117,8 @@ class Uploader {
 			detectedMimeType = "audio/wav";
 		} else if (detectedMimeType === "audio/x-flac") {
 			detectedMimeType = "audio/flac";
+		} else if (detectedMimeType === "audio/x-m4a") {
+			detectedMimeType = "audio/mp4";
 		}
 
 		res.setHeader("Content-Disposition", disposition);