diff --git a/CHANGES.md b/CHANGES.md
index ee52cbe23e8bf3ec412cccdbd2b30e2a3590949a..1563eae58f4e52fa18629c7e12c32a08396f6ebb 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,6 +4,10 @@ moodle-theme_boost_campus
 Changes
 -------
 
+### Unreleased
+
+* 2021-04-20 - Adjusted footer.mustache due to upstream changes in theme Boost core (MDL-70173).
+
 ### v3.10-r5
 
 * 2021-04-14 - Bugfix: Help Icon content in the modal dialog versions sometimes inherited unwanted CSS layout - Credits to @danowar2k
diff --git a/templates/footer.mustache b/templates/footer.mustache
index eec9b5539037a5f0ace69a1662fe9d6e1e51a0c5..f263ab83f6351d78ad61390daa2e5d0d0ec50c8c 100644
--- a/templates/footer.mustache
+++ b/templates/footer.mustache
@@ -42,8 +42,8 @@
 {{^bcbttbutton}}
 <div id="goto-top-link">
     {{! go to top is sticky to footer so needs to be sibling }}
-    <a class="btn btn-light" role="button" href="#">
-        {{#pix}} i/up, core, {{#str}} totop, theme_boost {{/str}}{{/pix}}
+    <a class="btn btn-light" role="button" href="#" aria-label="{{#str}} totop, theme_boost {{/str}}">
+        {{#pix}} i/up, core{{/pix}}
     </a>
 </div>
 {{/bcbttbutton}}
diff --git a/templates/footer.mustache.original b/templates/footer.mustache.original
index 2655fd4635c8cd461b8f1f1c26adda54d8195811..fca4e0609382501502350a698d9d12112508e82e 100644
--- a/templates/footer.mustache.original
+++ b/templates/footer.mustache.original
@@ -19,8 +19,8 @@
 }}
 <div id="goto-top-link">
     {{! go to top is sticky to footer so needs to be sibling }}
-    <a class="btn btn-light" role="button" href="#">
-        {{#pix}} i/up, core, {{#str}} totop, theme_boost {{/str}}{{/pix}}
+    <a class="btn btn-light" role="button" href="#" aria-label="{{#str}} totop, theme_boost {{/str}}">
+        {{#pix}} i/up, core{{/pix}}
     </a>
 </div>
 <footer id="page-footer" class="py-3 bg-dark text-light">