diff --git a/usr/themes/default/header.php b/usr/themes/default/header.php
index ac0046d3..d37c1398 100644
--- a/usr/themes/default/header.php
+++ b/usr/themes/default/header.php
@@ -47,7 +47,7 @@
             <div class="site-search col-3 kit-hidden-tb">
                 <form id="search" method="post" action="<?php $this->options->siteUrl(); ?>" role="search">
                     <label for="s" class="sr-only"><?php _e('搜索关键字'); ?></label>
-                    <input type="text" name="s" class="text" placeholder="<?php _e('输入关键字搜索'); ?>" />
+                    <input type="text" id="s" name="s" class="text" placeholder="<?php _e('输入关键字搜索'); ?>" />
                     <button type="submit" class="submit"><?php _e('搜索'); ?></button>
                 </form>
             </div>