diff --git a/static/webui/index.html b/static/webui/index.html
index e27a823a..bbe36075 100644
--- a/static/webui/index.html
+++ b/static/webui/index.html
@@ -3,8 +3,7 @@
 <head>
     <script>
         // Set theme early to prevent flash of incorrect style
-        const theme = localStorage.getItem("theme") || "dark";
-        document.documentElement.setAttribute("data-bs-theme", theme);
+        document.documentElement.setAttribute("data-bs-theme", localStorage.getItem("theme") || "dark");
     </script>
     <title>OpenWF WebUI</title>
     <meta name="viewport" content="width=device-width, initial-scale=1" />
