diff --git a/calendar/lib.php b/calendar/lib.php
index f685e02ac44..c3c64b895e7 100644
--- a/calendar/lib.php
+++ b/calendar/lib.php
@@ -2437,7 +2437,7 @@ function calendar_user_can_add_event($course) {
 
     calendar_get_allowed_types($allowed, $course);
 
-    return (bool)($allowed->user || $allowed->groups || $allowed->courses || $allowed->category || $allowed->site);
+    return (bool)($allowed->user || $allowed->groups || $allowed->courses || $allowed->categories || $allowed->site);
 }
 
 /**