diff --git a/devtools/test_dashboard/server.js b/devtools/test_dashboard/server.js
index 45f71d6e2fa..22484b1b91f 100644
--- a/devtools/test_dashboard/server.js
+++ b/devtools/test_dashboard/server.js
@@ -16,7 +16,8 @@ var PORT = process.argv[2] || 3000;
 var server = http.createServer(ecstatic({
     root: constants.pathToRoot,
     cache: 0,
-    gzip: true
+    gzip: true,
+    cors: true
 }));
 
 // Make watchified bundle for plotly.js