diff --git a/web/index.html b/web/index.html
index 9407221..78e5170 100644
--- a/web/index.html
+++ b/web/index.html
@@ -4,7 +4,7 @@
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, user-scalable=no">
     <title>Maunium sticker picker</title>
-    <link rel="modulepreload" href="src/widget-api.js">
+    <link rel="modulepreload" href="src/widget-api.js"/>
     <link rel="modulepreload" href="src/frequently-used.js"/>
     <link rel="modulepreload" href="src/spinner.js"/>
     <link rel="modulepreload" href="lib/htm/preact.js"/>