diff --git a/Modules/DataCollection/classes/Helpers/class.ilDclPropertyFormGUI.php b/Modules/DataCollection/classes/Helpers/class.ilDclPropertyFormGUI.php
index d00b7c5850c4..6d4ca8c299f0 100644
--- a/Modules/DataCollection/classes/Helpers/class.ilDclPropertyFormGUI.php
+++ b/Modules/DataCollection/classes/Helpers/class.ilDclPropertyFormGUI.php
@@ -46,7 +46,7 @@ public static function getTempFilename($a_hash, $a_field, $a_name, $a_type, $a_i
         $tmp_file_name = implode(
             "~~",
             array(
-                mb_substr(session_id(), 0, 8),
+                session_id(),
                 $a_hash,
                 $a_field,
                 $a_index,