diff --git a/sphinx/themes/basic/search.html b/sphinx/themes/basic/search.html
index 7446a8f25..6ac6b3899 100644
--- a/sphinx/themes/basic/search.html
+++ b/sphinx/themes/basic/search.html
@@ -33,7 +33,7 @@
     containing fewer words won't appear in the result list.{% endtrans %}
   </p>
   <form action="" method="get">
-    <input type="text" name="q" value="" />
+    <input type="text" name="q" aria-labelledby="search-documentation" value="" />
     <input type="submit" value="{{ _('search') }}" />
     <span id="search-progress" style="padding-left: 10px"></span>
   </form>