diff --git a/libraries/src/Document/OpensearchDocument.php b/libraries/src/Document/OpensearchDocument.php
index cb288f860fa9d..33c73425dca29 100644
--- a/libraries/src/Document/OpensearchDocument.php
+++ b/libraries/src/Document/OpensearchDocument.php
@@ -135,7 +135,7 @@ public function render($cache = false, $params = array())
 		$osns = 'http://a9.com/-/spec/opensearch/1.1/';
 
 		// Create the root element
-		$elOs = $xml->createElementNs($osns, 'OpensearchDescription');
+		$elOs = $xml->createElementNs($osns, 'OpenSearchDescription');
 
 		$elShortName = $xml->createElementNs($osns, 'ShortName');
 		$elShortName->appendChild($xml->createTextNode(htmlspecialchars($this->_shortName)));