diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index ad8433617a7..d93e18850f2 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -3183,8 +3183,8 @@ function require_logout() {
  */
 function require_course_login($courseorid, $autologinguest = true, $cm = NULL, $setwantsurltome = true, $preventredirect = false) {
     global $CFG, $PAGE, $SITE;
-    $issite = (is_object($courseorid) and $courseorid->id == SITEID)
-          or (!is_object($courseorid) and $courseorid == SITEID);
+    $issite = ((is_object($courseorid) and $courseorid->id == SITEID)
+          or (!is_object($courseorid) and $courseorid == SITEID));
     if ($issite && !empty($cm) && !($cm instanceof cm_info)) {
         // note: nearly all pages call get_fast_modinfo anyway and it does not make any
         // db queries so this is not really a performance concern, however it is obviously