diff --git a/inc/instance-config.php b/inc/instance-config.php
index ac8fa290..0388b2a9 100644
--- a/inc/instance-config.php
+++ b/inc/instance-config.php
@@ -125,6 +125,7 @@ $config['allowed_ext'][] = 'bmp';
 $config['allowed_ext'][] = 'gif';
 $config['allowed_ext'][] = 'png';
 
+$config['allowed_ext_files'][] = 'mp3';
 $config['allowed_ext_files'][] = 'mp4';
 $config['allowed_ext_files'][] = 'pdf';
 $config['allowed_ext_files'][] = 'txt';