diff --git a/conf/jetty/webdefault.xml b/conf/jetty/webdefault.xml
index 04d6374..a78925c 100644
--- a/conf/jetty/webdefault.xml
+++ b/conf/jetty/webdefault.xml
@@ -499,6 +499,10 @@
       <extension>dmg</extension>
       <mime-type>application/octet-stream</mime-type>
   </mime-mapping>
+  <mime-mapping>
+      <extension>mjs</extension>
+      <mime-type>application/x-javascript</mime-type>
+  </mime-mapping>
   <!-- ==================================================================== -->
   <welcome-file-list>
     <welcome-file>index.html</welcome-file>
diff --git a/conf/jetty/webdefault.xml.production b/conf/jetty/webdefault.xml.production
index b64e748..c3b1ff1 100644
--- a/conf/jetty/webdefault.xml.production
+++ b/conf/jetty/webdefault.xml.production
@@ -519,6 +519,10 @@
       <extension>dmg</extension>
       <mime-type>application/octet-stream</mime-type>
   </mime-mapping>
+  <mime-mapping>
+      <extension>mjs</extension>
+      <mime-type>application/x-javascript</mime-type>
+  </mime-mapping>
 
   <!-- ==================================================================== -->
   <welcome-file-list>