diff --git a/_layouts/default.html b/_layouts/default.html
index 1d41a71..3238266 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -101,7 +101,7 @@ layout: table_wrappers
{% endunless %}
{% if site.heading_anchors != false %}
- {% include vendor/anchor_headings.html html=content beforeHeading="true" anchorBody="" anchorClass="anchor-heading" %}
+ {% include vendor/anchor_headings.html html=content beforeHeading="true" anchorBody="" anchorClass="anchor-heading" anchorAttrs="aria-labelledby=\"%html_id%\"" %}
{% else %}
{{ content }}
{% endif %}