diff --git a/tools/server/public_simplechat/index.html b/tools/server/public_simplechat/index.html
index d34a80dfb8..67a3834eb1 100644
--- a/tools/server/public_simplechat/index.html
+++ b/tools/server/public_simplechat/index.html
@@ -11,7 +11,7 @@
         <script type="importmap">
             {
                 "imports": {
-                    "simplechat": "./simplechat.js"
+                    "simplechat": "./simplechat.js",
                     "datautils": "./datautils.mjs",
                     "ui": "./ui.mjs"
                 }