diff --git a/src/vector/index.ts b/src/vector/index.ts
index a8f1538fc0..52fd2b6a87 100644
--- a/src/vector/index.ts
+++ b/src/vector/index.ts
@@ -78,10 +78,7 @@ function checkBrowserFeatures() {
     return featureComplete;
 }
 
-let acceptBrowser = checkBrowserFeatures();
-if (!acceptBrowser && window.localStorage) {
-    acceptBrowser = Boolean(window.localStorage.getItem("mx_accepts_unsupported_browser"));
-}
+const supportedBrowser = checkBrowserFeatures();
 
 // React depends on Map & Set which we check for using modernizr's es6collections
 // if modernizr fails we may not have a functional react to show the error message.
@@ -148,6 +145,11 @@ async function start() {
         // await things settling so that any errors we have to render have features like i18n running
         await settled(loadSkinPromise, loadThemePromise, loadLanguagePromise);
 
+        let acceptBrowser = supportedBrowser;
+        if (!acceptBrowser && window.localStorage) {
+            acceptBrowser = Boolean(window.localStorage.getItem("mx_accepts_unsupported_browser"));
+        }
+
         // ##########################
         // error handling begins here
         // ##########################