diff --git a/mod/book/templates/main_action_menu.mustache b/mod/book/templates/main_action_menu.mustache
index f076b888553..5fb2a55f920 100644
--- a/mod/book/templates/main_action_menu.mustache
+++ b/mod/book/templates/main_action_menu.mustache
@@ -42,14 +42,14 @@
     <div class="d-flex">
         {{#previous}}
             <div class="navitem">
-                <a class="btn btn-link btn-previous" href="{{url}}#mod_book-chapter" title="{{title}}">
+                <a class="btn btn-link btn-previous" href="{{url}}#mod_book-chapter" title="{{title}}" aria-label="{{title}}">
                     {{#pix}} i/previous, core {{/pix}}
                 </a>
             </div>
         {{/previous}}
         {{#next}}
             <div class="navitem ms-auto">
-                <a class="btn btn-link btn-next" href="{{url}}#mod_book-chapter" title="{{title}}">
+                <a class="btn btn-link btn-next" href="{{url}}#mod_book-chapter" title="{{title}}" aria-label="{{title}}">
                     {{#pix}} i/next, core {{/pix}}
                 </a>
             </div>