diff --git a/src/System/Status/StatusChecker.php b/src/System/Status/StatusChecker.php
index 34d9ec13d79..533ffb864b9 100644
--- a/src/System/Status/StatusChecker.php
+++ b/src/System/Status/StatusChecker.php
@@ -389,11 +389,14 @@ public static function getCASStatus($public_only = true): array
         if ($status === null) {
             $status['status'] = self::STATUS_NO_DATA;
             if (!empty($CFG_GLPI['cas_host'])) {
-                $url = $CFG_GLPI['cas_host'];
+                // Rebuild CAS URL
+                // see `CAS_Client::_getServerBaseURL()`
+                $url = 'https://' . $CFG_GLPI['cas_host'];
                 if (!empty($CFG_GLPI['cas_port'])) {
                     $url .= ':' . (int)$CFG_GLPI['cas_port'];
                 }
                 $url .= '/' . $CFG_GLPI['cas_uri'];
+
                 if (Toolbox::isUrlSafe($url)) {
                     $data = Toolbox::getURLContent($url);
                     if (!empty($data)) {