diff --git a/adm/admin.head.php b/adm/admin.head.php
index c175f62f3..c8253f8ac 100644
--- a/adm/admin.head.php
+++ b/adm/admin.head.php
@@ -95,7 +95,7 @@ function imageview(id, w, h)
                     continue;
                 }
                 $current_class = "";
-                if (isset($sub_menu) && (substr($sub_menu, 0, 2) == substr($menu['menu'.$key][0][0], 0, 2)))
+                if (isset($sub_menu) && (substr($sub_menu, 0, 3) == substr($menu['menu'.$key][0][0], 0, 3)))
                     $current_class = " gnb_1dli_air";
                 $gnb_str .= '<li class="gnb_1dli'.$current_class.'">'.PHP_EOL;
                 $gnb_str .=  $href1 . $menu['menu'.$key][0][1] . $href2;