diff --git a/modules/ui/tools/sidebar_toggle.js b/modules/ui/tools/sidebar_toggle.js
index bd0759699..d99051a91 100644
--- a/modules/ui/tools/sidebar_toggle.js
+++ b/modules/ui/tools/sidebar_toggle.js
@@ -13,6 +13,7 @@ export function uiToolSidebarToggle(context) {
         selection
             .append('button')
             .attr('class', 'bar-button')
+            .attr('aria-label', t('sidebar.tooltip'))
             .on('click', function() {
                 context.ui().sidebar.toggle();
             })