diff --git a/components/ILIAS/User/classes/class.ilUserAutoComplete.php b/components/ILIAS/User/classes/class.ilUserAutoComplete.php
index ffe0bea156e8..6685705130c9 100755
--- a/components/ILIAS/User/classes/class.ilUserAutoComplete.php
+++ b/components/ILIAS/User/classes/class.ilUserAutoComplete.php
@@ -241,7 +241,7 @@ public function getList(string $a_str): string
 
         while (count($usr_ids) <= $max) {
             $next_records = $this->fetchNextRecords($res, $max);
-            $records = array_merge($records, $next_records);
+            $records = array_replace($records, $next_records);
             $usr_ids = array_keys($records);
 
             $callable_name = null;