diff --git a/api.php b/api.php
index 379ce7d..46f534e 100644
--- a/api.php
+++ b/api.php
@@ -1085,7 +1085,7 @@ switch($request[0]) {
 						}
 						$errors = array();
 						$mentorList = json_decode($_POST['mentors'],true);
-						if(!$is_array($mentorList)) {
+						if(!is_array($mentorList)) {
 							$ret['status'] = "error";
 							$ret['error'] = "mentors array parameter must be an array of mentors (or an empty array if no mentors)";
 							break;