diff --git a/lib.php b/lib.php
index e78c038..5f29854 100644
--- a/lib.php
+++ b/lib.php
@@ -247,7 +247,7 @@ function local_treestudyplan_find_cohortmembers($cohortid)
 {
     global $DB;
     // By default wherecondition retrieves all users except the deleted, not confirmed and guest.
-    $params['cohortid'] = $cohortid;
+    $params = ['cohortid' => $cohortid];
     $sql = "SELECT * FROM {user} u
                 JOIN {cohort_members} cm ON (cm.userid = u.id AND cm.cohortid = :cohortid)
             WHERE u.suspended = 0 AND u.id > 1