diff --git a/server/template.html b/server/template.html
index a8e01ae1e..cff451509 100644
--- a/server/template.html
+++ b/server/template.html
@@ -6,6 +6,7 @@
         <meta charset="UTF-8" />
 
         <meta http-equiv="x-ua-compatible" content="ie=edge">
+        <meta http-equiv="x-frame-options" content="deny">
         <meta name="viewport" content="width=device-width, initial-scale=1">
 
         <title>Scratch - {{title}}</title>