diff --git a/CHANGES.md b/CHANGES.md
index 2ada870fdf106491578e0b8a981fb56c3caea45a..f08b5a94eb9718a5e7474aad4f988d87f18e5a0c 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -6,6 +6,7 @@ Changes
 
 ### Unreleased
 
+* 2019-10-28 - Adjusted function favicon() in core_renderer.php due to upstream changes in Moodle core.
 * 2019-10-28 - Removed CSS rule for maintenance warning due to upstream changes.
 
 ### Release v3.7-r2
diff --git a/classes/output/core_renderer.php b/classes/output/core_renderer.php
index 6132a54f9e5dabec3df55559b8fef3cd954cb05f..800c4e329d36455a0d4e36a1c306dc95994d5076 100644
--- a/classes/output/core_renderer.php
+++ b/classes/output/core_renderer.php
@@ -115,12 +115,12 @@ class core_renderer extends \core_renderer {
     /**
      * Override to be able to use uploaded images from admin_setting as well.
      *
-     * Returns the URL for the favicon.
+     * 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 string The favicon URL
+     * @return moodle_url The moodle_url for the favicon
      */
     public function favicon() {
         global $PAGE;