diff --git a/theme/boost/classes/output/core_renderer.php b/theme/boost/classes/output/core_renderer.php
index 8047d6df207..3d7ba9ecf28 100644
--- a/theme/boost/classes/output/core_renderer.php
+++ b/theme/boost/classes/output/core_renderer.php
@@ -161,7 +161,8 @@ class core_renderer extends \core_renderer {
                 $heading = $this->page->course->fullname;
             } else {
                 $heading = $this->page->cm->get_formatted_name();
-                $imagedata = $this->pix_icon('monologo', '', $this->page->activityname, ['class' => 'activityicon']);
+                $imagedata = html_writer::img($this->page->cm->get_icon_url()->out(false), '',
+                    ['class' => 'icon activityicon', 'aria-hidden' => 'true']);
                 $purposeclass = plugin_supports('mod', $this->page->activityname, FEATURE_MOD_PURPOSE);
                 $purposeclass .= ' activityiconcontainer';
                 $purposeclass .= ' modicon_' . $this->page->activityname;