diff --git a/test/tree-basic.html b/test/tree-basic.html
index a9ea9ff1d3..e2f748e644 100644
--- a/test/tree-basic.html
+++ b/test/tree-basic.html
@@ -25,6 +25,7 @@
         <script src="lib/simpleRequire.js"></script>
         <script src="lib/config.js"></script>
         <script src="lib/jquery.min.js"></script>
+        <meta http-equiv="Content-Security-Policy" content="style-src 'self';" />
     </head>
     <body>
         <style>
@@ -128,4 +129,4 @@
             });
         </script>
     </body>
-</html>
\ No newline at end of file
+</html>
