diff --git a/conf/mime.types b/conf/mime.types
index 1c00d701a..3f0dc72e2 100644
--- a/conf/mime.types
+++ b/conf/mime.types
@@ -5,7 +5,7 @@ types {
     text/xml                                         xml;
     image/gif                                        gif;
     image/jpeg                                       jpeg jpg;
-    application/javascript                           js;
+    application/javascript                           js mjs;
     application/atom+xml                             atom;
     application/rss+xml                              rss;