diff --git a/layouts/shortcodes/alert.md b/layouts/shortcodes/alert.md
index d529b4ecf..48a9b2ece 100644
--- a/layouts/shortcodes/alert.md
+++ b/layouts/shortcodes/alert.md
@@ -2,7 +2,7 @@
 
 <div class="alert alert-{{ $color }}" role="alert">
 {{- with .Get "title" -}}
-  <div class="h4 alert-heading">
+  <div class="h4 alert-heading" role="heading">
     {{- . | safeHTML -}}
   </div>
 {{/* Do **not** remove this comment! It ends the previous HTML block; see https://spec.commonmark.org/0.30/#html-blocks, 7. */}}