diff --git a/src/XML/auth/AbstractConstrainedValueType.php b/src/XML/auth/AbstractConstrainedValueType.php
index 1337cefa..0549886b 100644
--- a/src/XML/auth/AbstractConstrainedValueType.php
+++ b/src/XML/auth/AbstractConstrainedValueType.php
@@ -7,6 +7,7 @@
 use DOMElement;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\XML\Chunk;
+use SimpleSAML\XML\Exception\InvalidDOMElementException;
 use SimpleSAML\XML\Exception\MissingElementException;
 use SimpleSAML\XML\Exception\TooManyElementsException;
 use SimpleSAML\XML\ExtendableElementTrait;