diff --git a/manifests/params.pp b/manifests/params.pp
index 412d8c623..d25e8b58a 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -22,7 +22,7 @@
       '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',
       'text/mathml'                                                               => 'mml',