diff --git a/modules/helfi_toc/assets/js/tableOfContents.js b/modules/helfi_toc/assets/js/tableOfContents.js
index 5e3e03070..12d6cef61 100644
--- a/modules/helfi_toc/assets/js/tableOfContents.js
+++ b/modules/helfi_toc/assets/js/tableOfContents.js
@@ -181,6 +181,8 @@
           }
           // Create anchor links.
           content.setAttribute('id', anchorName);
+          content.setAttribute('tabindex', '-1');  // Set tabindex to -1 to avoid issues with screen readers.
+          content.setAttribute('class', 'toc-focusable');
         });
 
       if (tableOfContents) {