diff --git a/modules/member/tpl/member_list.html b/modules/member/tpl/member_list.html
index a77844a37..44ca3fbce 100644
--- a/modules/member/tpl/member_list.html
+++ b/modules/member/tpl/member_list.html
@@ -123,7 +123,7 @@
 		<!--@end-->
 	</select>
 	<select name="search_target" style="margin-right:4px" title="{$lang->search_target}">
-		{@$lang->search_target_list = array_merge($usedIdentifiers, $lang->search_target_list)}
+		{@$lang->search_target_list = array_merge($usedIdentifiers, $lang->search_target_list->getArrayCopy())}
 		<option value="{$key}" loop="$lang->search_target_list=>$key,$val" selected="selected"|cond="$search_target==$key">{$val}</option>
 	</select>
 	<input type="search" name="search_keyword" value="{htmlspecialchars($search_keyword, ENT_COMPAT | ENT_HTML401, 'UTF-8', false)}" style="width:140px">