diff --git a/classes/output/grading_hints_renderer.php b/classes/output/grading_hints_renderer.php
index d03bf111b1783dfca2b2ae96594c3796a6dc2b25..476f8b0dab485d065c229f72645ac759066de8c7 100644
--- a/classes/output/grading_hints_renderer.php
+++ b/classes/output/grading_hints_renderer.php
@@ -110,8 +110,8 @@ class grading_hints_renderer
         $heading = '<div style="text-align:left;width:'. $titlewidth .'%;display:inline-block;">';
 
         if ($this->showfeedbackdata && $node->getSeparateFeedbackData()->has_internal_error()) {
-            $heading .= '<div style="font-family: FontAwesome; font-size: 1.5em;margin-right:20px;".'
-                . '"display:inline-block;">&#xf00d;</div>';
+            $heading .= '<div style="font-size: 1.5em;margin-right:20px;".'
+                . '"display:inline-block;"><span class="fa fa-close"/></div>';
         }
 
         $heading .= '<div style="vertical-align: text-bottom;display:inline-block;">' . $node->get_heading();
diff --git a/classes/output/renderer.php b/classes/output/renderer.php
index 02a86d46066ee2e910adb87c825aa047e7b55ec3..2193f85c877ea18c6b0efecce59683de2ae2e2ba 100644
--- a/classes/output/renderer.php
+++ b/classes/output/renderer.php
@@ -745,7 +745,7 @@ class qtype_moopt_renderer extends qtype_renderer {
                         $responsefileinfos['filename'], true);
                     $downloadable_responsefilename = $responsefileinfos['filename'];
                     $html .= "<a href='$url' style='display:block;text-align:right;'>" .
-                        " <span class='fa-solid fa-download'></span> " .
+                        " <span class='fa fa-download'></span> " .
                         get_string('downloadcompletefile', 'qtype_moopt', $downloadable_responsefilename) . "</a>";
                 }
                 return $html;