diff --git a/main/inc/lib/course.lib.php b/main/inc/lib/course.lib.php
index d5fe8246e3..edac3d65ba 100644
--- a/main/inc/lib/course.lib.php
+++ b/main/inc/lib/course.lib.php
@@ -3835,6 +3835,7 @@ class CourseManager {
         }
         return $_course;
     }
+    
     /**
      * Return a link to go to the course, validating the visibility of the
      * course and the user status
@@ -3843,7 +3844,7 @@ class CourseManager {
      * @param array  List of courses to which the user is subscribed (if not provided, will be generated)
      * @return mixed 'enter' for a link to go to the course or 'register' for a link to subscribe, or false if no access
      */
-    function get_access_link_by_user($uid, $course, $user_courses = null) {
+    static function get_access_link_by_user($uid, $course, $user_courses = null) {
         if (empty($uid) or empty($course)) { return false; }
         if (!is_array($user_courses)) {
             // get the array of courses to which the user is subscribed