diff --git a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
index 81bf1a6ccd07..16b9b48c2061 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
@@ -672,7 +672,7 @@ private function validateAlias(\DOMElement $alias, $file)
         }
 
         foreach ($alias->childNodes as $child) {
-            if (!$child instanceof \DOMElement && self::NS !== $child->namespaceURI) {
+            if (!$child instanceof \DOMElement || self::NS !== $child->namespaceURI) {
                 continue;
             }
             if (!\in_array($child->localName, ['deprecated'], true)) {