diff --git a/src/Components/PageTools.php b/src/Components/PageTools.php
index 8316b64c..f2b7c730 100644
--- a/src/Components/PageTools.php
+++ b/src/Components/PageTools.php
@@ -28,7 +28,6 @@
 
 use Action;
 use MediaWiki\MediaWikiServices;
-use MWNamespace;
 use Skins\Chameleon\ChameleonTemplate;
 use Skins\Chameleon\IdRegistry;
 
@@ -196,7 +195,9 @@ public function getNamespaceKey() {
 		// Gets the subject namespace of this title
 		$title = $this->getSkinTemplate()->getSkin()->getTitle();
 
-		$namespaceKey = MWNamespace::getCanonicalName( $title->getNamespace() );
+		$namespaceKey = MediaWikiServices::getInstance()->getNamespaceInfo()->getCanonicalName(
+			$title->getNamespace()
+		);
 
 		if ( $namespaceKey === false ) {
 			$namespaceKey = $title->getNsText();