diff --git a/calendar/lib.php b/calendar/lib.php
index 7377d4481de..8810d7e1ff3 100644
--- a/calendar/lib.php
+++ b/calendar/lib.php
@@ -3205,6 +3205,7 @@ function calendar_update_subscription($subscription) {
  * @return bool true if current user can edit the subscription else false
  */
 function calendar_can_edit_subscription($subscriptionorid) {
+    global $USER;
     if (is_array($subscriptionorid)) {
         $subscription = (object)$subscriptionorid;
     } else if (is_object($subscriptionorid)) {
@@ -3225,7 +3226,7 @@ function calendar_can_edit_subscription($subscriptionorid) {
     calendar_get_allowed_types($allowed, $courseid, null, $category);
     switch ($subscription->eventtype) {
         case 'user':
-            return $allowed->user;
+            return ($USER->id == $subscription->userid && $allowed->user);
         case 'course':
             if (isset($allowed->courses[$courseid])) {
                 return $allowed->courses[$courseid];