diff --git a/index.html b/index.html
index 1ae5b02..0a881ce 100644
--- a/index.html
+++ b/index.html
@@ -58,7 +58,7 @@
 if (typeof openpgp.config === "object") {
   document.getElementById('worksCheck').insertAdjacentHTML('beforeend', '<br><div class="alert alert-success" role="alert">' + openpgp.config.versionstring + ' works in this browser!</div>');
 } else {
-  document.getElementById('worksCheck').insertAdjacentHTML('beforeend', '<br><div class="alert alert-success" role="alert">OpenPGP.js won\'t start in this browser.</div>');
+  document.getElementById('worksCheck').insertAdjacentHTML('beforeend', '<br><div class="alert alert-danger" role="alert">OpenPGP.js won\'t start in this browser.</div>');
 }
 </script>
 </html>