diff --git a/preferences/inc/class.uisettings.inc.php b/preferences/inc/class.uisettings.inc.php
index bbb830f160..52ba7a9a55 100755
--- a/preferences/inc/class.uisettings.inc.php
+++ b/preferences/inc/class.uisettings.inc.php
@@ -529,7 +529,7 @@
 						$extra = array('**NULL**' => lang('Users choice'));
 						break;
 				}
-				if ($extra) $values = array_merge((array)$extra , (array)$values);
+				if ($extra) $values = $extra + $values;
 
 				$select = html::select($GLOBALS['type'].'['.$name.']',$default,$values,true);
 			}