diff --git a/classes/output/manage/base_table.php b/classes/output/manage/base_table.php
index a5387d5..8848d40 100644
--- a/classes/output/manage/base_table.php
+++ b/classes/output/manage/base_table.php
@@ -84,7 +84,7 @@ class base_table extends flexible_table {
         $buttons .= html_writer::link(
             new moodle_url('/auth/outage/info.php', ['id' => $outage->id]),
             html_writer::empty_tag('img', [
-                'src' => $OUTPUT->pix_url('t/preview'),
+                'src' => $OUTPUT->image_url('t/preview'),
                 'alt' => get_string('view'),
                 'class' => 'iconsmall',
 
@@ -100,7 +100,7 @@ class base_table extends flexible_table {
             $buttons .= html_writer::link(
                 new moodle_url('/auth/outage/edit.php', ['edit' => $outage->id]),
                 html_writer::empty_tag('img', [
-                    'src' => $OUTPUT->pix_url('t/edit'),
+                    'src' => $OUTPUT->image_url('t/edit'),
                     'alt' => get_string('edit'),
                     'class' => 'iconsmall',
                 ]),
@@ -112,7 +112,7 @@ class base_table extends flexible_table {
         $buttons .= html_writer::link(
             new moodle_url('/auth/outage/edit.php', ['clone' => $outage->id]),
             html_writer::empty_tag('img', [
-                'src' => $OUTPUT->pix_url('t/copy'),
+                'src' => $OUTPUT->image_url('t/copy'),
                 'alt' => get_string('clone', 'auth_outage'),
                 'class' => 'iconsmall',
 
@@ -125,7 +125,7 @@ class base_table extends flexible_table {
             $buttons .= html_writer::link(
                 new moodle_url('/auth/outage/finish.php', ['id' => $outage->id]),
                 html_writer::empty_tag('img', [
-                    'src' => $OUTPUT->pix_url('t/check'),
+                    'src' => $OUTPUT->image_url('t/check'),
                     'alt' => get_string('finish', 'auth_outage'),
                     'class' => 'iconsmall',
                 ]),
@@ -138,7 +138,7 @@ class base_table extends flexible_table {
             $buttons .= html_writer::link(
                 new moodle_url('/auth/outage/delete.php', ['id' => $outage->id]),
                 html_writer::empty_tag('img', [
-                    'src' => $OUTPUT->pix_url('t/delete'),
+                    'src' => $OUTPUT->image_url('t/delete'),
                     'alt' => get_string('delete'),
                     'class' => 'iconsmall',
                 ]),
diff --git a/classes/output/renderer.php b/classes/output/renderer.php
index 43cc826..d7daca5 100644
--- a/classes/output/renderer.php
+++ b/classes/output/renderer.php
@@ -178,14 +178,14 @@ class renderer extends plugin_renderer_base {
         $url = new moodle_url('/auth/outage/edit.php', ['edit' => $outage->id]);
         $img = html_writer::empty_tag(
             'img',
-            ['src' => $OUTPUT->pix_url('t/edit'), 'alt' => get_string('edit'), 'class' => 'iconsmall']
+            ['src' => $OUTPUT->image_url('t/edit'), 'alt' => get_string('edit'), 'class' => 'iconsmall']
         );
         $linkedit = html_writer::link($url, $img, ['title' => get_string('edit')]);
 
         $url = new moodle_url('/auth/outage/delete.php', ['id' => $outage->id]);
         $img = html_writer::empty_tag(
             'img',
-            ['src' => $OUTPUT->pix_url('t/delete'), 'alt' => get_string('delete'), 'class' => 'iconsmall']
+            ['src' => $OUTPUT->image_url('t/delete'), 'alt' => get_string('delete'), 'class' => 'iconsmall']
         );
         $linkdelete = html_writer::link($url, $img, ['title' => get_string('delete')]);
 
diff --git a/tests/phpunit/local/outagelib_test.php b/tests/phpunit/local/outagelib_test.php
index ba39c42..b66d524 100644
--- a/tests/phpunit/local/outagelib_test.php
+++ b/tests/phpunit/local/outagelib_test.php
@@ -105,8 +105,6 @@ class outagelib_test extends advanced_testcase {
         $size = strlen($CFG->additionalhtmltopofbody);
         outagelib::inject();
         self::assertSame($size, strlen($CFG->additionalhtmltopofbody));
-
-        $this->resetDebugging(); // Function pix_url deprecated in Moodle 33+.
     }
 
     /**
@@ -142,8 +140,6 @@ class outagelib_test extends advanced_testcase {
         outagelib::reinject();
         self::assertContains('<style>', $CFG->additionalhtmltopofbody);
         self::assertContains('<script>', $CFG->additionalhtmltopofbody);
-
-        $this->resetDebugging(); // Function pix_url deprecated in Moodle 33+.
     }
 
     /**
@@ -503,8 +499,6 @@ EOT;
         outagelib::reinject();
 
         self::assertNotEmpty($CFG->additionalhtmltopofbody);
-
-        $this->resetDebugging(); // Function pix_url deprecated in Moodle 33+.
     }
 
     private function create_outage() {
diff --git a/views/warningbar/warningbar.php b/views/warningbar/warningbar.php
index 5b80dbd..ec83790 100644
--- a/views/warningbar/warningbar.php
+++ b/views/warningbar/warningbar.php
@@ -48,7 +48,7 @@ if (!$viewbag['static']) {
     if (is_siteadmin()) {
         $url = new moodle_url('/auth/outage/finish.php', ['id' => $viewbag['outage']->id]);
         $text = html_writer::empty_tag('img', [
-                'src' => $OUTPUT->pix_url('t/check'),
+                'src' => $OUTPUT->image_url('t/check'),
                 'alt' => get_string('finish', 'auth_outage'),
                 'class' => 'iconsmall',
             ]).' '.get_string('finish', 'auth_outage');