diff --git a/CHANGES.md b/CHANGES.md
index d0047fe78b9021d92101f1aa3beec645abe2a039..0b0b750aafb59a7c4944babc147e4b73cf96a621 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -6,6 +6,7 @@ Changes
 
 ### Unreleased
 
+* 2020-09-24 - Fixed bug that theme Boost Campus Child did not show the favicon set in parent theme Boost Campus.
 * 2020-06-09 - Improved SCSS settings to be used with admin_setting_scsscode that validates the code before saving.
 
 ### v3.8-r1
diff --git a/classes/output/core_renderer.php b/classes/output/core_renderer.php
new file mode 100644
index 0000000000000000000000000000000000000000..6437a15c75f42350c315c92c34249a0916dc57ba
--- /dev/null
+++ b/classes/output/core_renderer.php
@@ -0,0 +1,72 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Renderers to align Moodle's HTML with that expected by Bootstrap
+ *
+ * @package   theme_boost_campus_child
+ * @copyright 2017 Kathrin Osswald, Ulm University kathrin.osswald@uni-ulm.de
+ *            copyright based on code from theme_boost by Bas Brands
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace theme_boost_campus_child\output;
+
+use moodle_url;
+use theme_config;
+
+defined('MOODLE_INTERNAL') || die;
+
+
+/**
+ * Extending the core_renderer interface.
+ *
+ * @copyright 2020 Kathrin Osswald, Ulm University kathrin.osswald@uni-ulm.de
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @package theme_boost_campus_child
+ * @category output
+ */
+class core_renderer extends \core_renderer {
+
+    /**
+     * Override to be able to use uploaded images from admin_setting as well.
+     *
+     * Returns the moodle_url for the favicon.
+     *
+     * KIZ MODIFICATION: This renderer function is copied and modified from /lib/outputrenderers.php
+     *
+     * @since Moodle 2.5.1 2.6
+     * @return moodle_url The moodle_url for the favicon
+     */
+    public function favicon() {
+        // MODIFICATION START.
+        // Get the theme Boost Campus config.
+        $bcconfig = theme_config::load('boost_campus');
+        // Get the theme Boost Campus favicon setting.
+        $bcconffavicon = get_config('theme_boost_campus', 'favicon');
+        if (!empty($bcconffavicon)) {
+            // Return the image that was saved in the theme Boost Campus favicon setting.
+            return $bcconfig->setting_file_url('favicon', 'favicon');
+        } else {
+            // Return the icon stored in boost_campus/pix folder.
+            return $bcconfig->image_url('favicon', 'theme');
+        }
+        // MODIFICATION END.
+        /* ORIGINAL START.
+        return $this->image_url('favicon', 'theme');
+        ORIGINAL END. */
+    }
+}