diff --git a/src/LocalizedStringElementTrait.php b/src/LocalizedStringElementTrait.php
index 6fa8613..e54877d 100644
--- a/src/LocalizedStringElementTrait.php
+++ b/src/LocalizedStringElementTrait.php
@@ -93,7 +93,7 @@ public static function fromXML(DOMElement $xml): static
     final public function toXML(DOMElement $parent = null): DOMElement
     {
         $e = $this->instantiateParentElement($parent);
-        $e->setAttributeNS(C::NS_XML, 'xml:lang', $this->language);
+        $e->setAttributeNS(C::NS_XML, 'xml:lang', $this->getLanguage());
         $e->textContent = $this->getContent();
 
         return $e;