diff --git a/mod/bigbluebuttonbn/tests/generator/lib.php b/mod/bigbluebuttonbn/tests/generator/lib.php
index b11cc56425e..3ab0b576167 100644
--- a/mod/bigbluebuttonbn/tests/generator/lib.php
+++ b/mod/bigbluebuttonbn/tests/generator/lib.php
@@ -232,6 +232,7 @@ class mod_bigbluebuttonbn_generator extends \testing_module_generator {
      * @throws moodle_exception
      */
     protected function create_mockserver_recording(instance $instance, stdClass $recordingdata, array $data): string {
+        global $CFG;
         $mockdata = array_merge((array) $recordingdata, [
             'meetingID' => $instance->get_meeting_id(),
             'meta' => [
@@ -247,6 +248,12 @@ class mod_bigbluebuttonbn_generator extends \testing_module_generator {
             ],
         ]);

+        // If an alternative callback WWWROOT has been defined, apply for it.
+        if (defined("TEST_MOD_BIGBLUEBUTTONBN_CALLBACK_WWWROOT")) {
+            $mockdata['meta']['bn-recording-ready-url'] = str_replace(
+                $CFG->wwwroot, TEST_MOD_BIGBLUEBUTTONBN_CALLBACK_WWWROOT, $mockdata['meta']['bn-recording-ready-url']);
+        }
+
         $result = $this->send_mock_request('backoffice/createRecording', [], $mockdata);

         return (string) $result->recordID;