diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-facets.inc b/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-facets.inc
index 180eee8561..e56965d663 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-facets.inc
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-facets.inc
@@ -6,7 +6,7 @@
 [% SET OPACResultsSidebar = AdditionalContents.get( location => "OPACResultsSidebar", lang => lang, library => logged_in_user.branchcode || default_branch ) %]
 [% IF ( opacfacets && facets_loop && total ) %]
     <div id="search-facets">
-        <h2><a href="#" class="menu-collapse-toggle">Refine your search</a></h2>
+        <h2><a href="#" class="menu-collapse-toggle" aria-expanded="false">Refine your search</a></h2>
         <ul class="menu-collapse">
             [% IF Koha.Preference("SavedSearchFilters") && search_filters.size > 0 %]
                 <li id="search-filters">
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-topissues.inc b/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-topissues.inc
index 4753ae139f..b6c53f7b47 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-topissues.inc
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-topissues.inc
@@ -5,7 +5,7 @@
 
 <div id="search-facets">
     <form method="get" action="/cgi-bin/koha/opac-topissues.pl">
-        <h2><a href="#" class="menu-collapse-toggle">Refine your search</a></h2>
+        <h2><a href="#" class="menu-collapse-toggle" aria-expanded="false">Refine your search</a></h2>
         <ul class="menu-collapse">
             <li
                 ><label for="limit">Show the top </label>
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-full-serial-issues.tt b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-full-serial-issues.tt
index b4283e7738..79aebe1eb6 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-full-serial-issues.tt
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-full-serial-issues.tt
@@ -76,7 +76,7 @@
                     <div id="search-facets">
                         <form method="get" action="/cgi-bin/koha/opac-serial-issues.pl" id="filterform">
                             <legend
-                                ><h2><a href="#" class="menu-collapse-toggle">Refine your search</a></h2></legend
+                                ><h2><a href="#" class="menu-collapse-toggle" aria-expanded="false">Refine your search</a></h2></legend
                             >
                             <ul class="menu-collapse">
                                 <li>
diff --git a/koha-tmpl/opac-tmpl/bootstrap/js/global.js b/koha-tmpl/opac-tmpl/bootstrap/js/global.js
index a3c5a3ce86..15fc44db36 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/js/global.js
+++ b/koha-tmpl/opac-tmpl/bootstrap/js/global.js
@@ -233,10 +233,13 @@ if (typeof enquire == "object") {
 
 function facetMenu(action) {
     if (action == "show") {
-        $(".menu-collapse-toggle").off("click", facetHandler);
+        $(".menu-collapse-toggle")
+            .removeAttr("aria-expanded")
+            .off("click", facetHandler);
         $(".menu-collapse").show();
     } else {
         $(".menu-collapse-toggle")
+            .attr("aria-expanded", "false")
             .on("click", facetHandler)
             .removeClass("menu-open");
         $(".menu-collapse").hide();
@@ -247,8 +250,14 @@ var facetHandler = function (e) {
     e.preventDefault();
     $(this).toggleClass("menu-open");
     $(".menu-collapse").toggle();
+    setAriaExpandable(e);
 };
 
+function setAriaExpandable(e) {
+    let currentValue = $(e.target).attr("aria-expanded");
+    $(e.target).attr("aria-expanded", currentValue === "false");
+}
+
 function setPlaceholder() {
     let search_placeholder = $("#masthead_search option:selected").data(
         "placeholder"