diff --git a/src/XML/cas/Attributes.php b/src/XML/cas/Attributes.php
index 96c9c0d..0806686 100644
--- a/src/XML/cas/Attributes.php
+++ b/src/XML/cas/Attributes.php
@@ -7,7 +7,6 @@
 use DOMElement;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\CAS\Constants as C;
-use SimpleSAML\XML\Chunk;
 use SimpleSAML\XML\Exception\InvalidDOMElementException;
 use SimpleSAML\XML\Exception\MissingElementException;
 use SimpleSAML\XML\ExtendableElementTrait;