diff --git a/lib/classes/output/requirements/page_requirements_manager.php b/lib/classes/output/requirements/page_requirements_manager.php
index e6b86afd28b..9771504f43c 100644
--- a/lib/classes/output/requirements/page_requirements_manager.php
+++ b/lib/classes/output/requirements/page_requirements_manager.php
@@ -358,7 +358,7 @@ class page_requirements_manager {
     protected function get_api_base(): string {
         global $CFG;
 
-        if (!empty($CFG->router_configured)) {
+        if (!empty($CFG->routerconfigured)) {
             return sprintf(
                 "%s/api",
                 $CFG->wwwroot,