diff --git a/pkg/emscripten/proto.html b/pkg/emscripten/proto.html
index 41d5519f08..fadc1ffa13 100644
--- a/pkg/emscripten/proto.html
+++ b/pkg/emscripten/proto.html
@@ -9,7 +9,7 @@
     <!-- Font Awesome -->
     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.0/css/font-awesome.min.css">
     <!-- Material Design Bootstrap -->
-    <link href="mdb/css/mdb.min.css" rel="stylesheet">
+    <link href="//cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.1.1/css/mdb.min.css" rel="stylesheet">
    
    <link href="proto.css" rel="stylesheet" type="text/css">
    <link rel="shortcut icon" href="media/icon_dark.ico" />