diff --git a/source/_includes/header.html b/source/_includes/header.html
index fa076d1..6f52ed5 100644
--- a/source/_includes/header.html
+++ b/source/_includes/header.html
@@ -26,7 +26,7 @@
 	</div>
 	<form class="search" action="{{ site.simple_search }}" method="get">
 		<input class="alignright" type="text" name="q" results="0">
-		<input type="hidden" name="q" value="site:{{ site.url | shorthand_url }}">
+		<input type="hidden" name="sites" value="{{ site.url | shorthand_url }}">
 	</form>
 </div>
 {% include custom/header.html %}