diff --git a/qt/aqt/mediasrv.py b/qt/aqt/mediasrv.py
index 8c5d8c91f..be5a2d1bb 100644
--- a/qt/aqt/mediasrv.py
+++ b/qt/aqt/mediasrv.py
@@ -131,6 +131,8 @@ def allroutes(pathin):
         if fullpath.endswith(".css"):
             # some users may have invalid mime type in the Windows registry
             mimetype = "text/css"
+        elif fullpath.endswith(".js"):
+            mimetype = "application/javascript"
         else:
             # autodetect
             mimetype = None