diff --git a/lib/adminlib.php b/lib/adminlib.php
index 54ea2fd7103..51ab7f0401b 100644
--- a/lib/adminlib.php
+++ b/lib/adminlib.php
@@ -8440,16 +8440,11 @@ class admin_setting_enablemobileservice extends admin_setting_configcheckbox {
      * @return string XHTML
      */
     public function output_html($data, $query='') {
-        global $CFG, $OUTPUT;
+        global $OUTPUT;
         $html = parent::output_html($data, $query);
 
         if ((string)$data === $this->yes) {
-            require_once($CFG->dirroot . "/lib/filelib.php");
-            $curl = new curl();
-            $httpswwwroot = str_replace('http:', 'https:', $CFG->wwwroot); //force https url
-            $curl->head($httpswwwroot . "/login/index.php");
-            $info = $curl->get_info();
-            if (empty($info['http_code']) or ($info['http_code'] >= 400)) {
+            if (!is_https()) {
                $html .= $OUTPUT->notification(get_string('nohttpsformobilewarning', 'admin'));
             }
         }