diff --git a/src/XML/fed/AutomaticPseudonyms.php b/src/XML/fed/AutomaticPseudonyms.php
new file mode 100644
index 00000000..5a69b258
--- /dev/null
+++ b/src/XML/fed/AutomaticPseudonyms.php
@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\WSSecurity\XML\fed;
+
+use DOMElement;
+use SimpleSAML\Assert\Assert;
+use SimpleSAML\XML\Exception\InvalidDOMElementException;
+use SimpleSAML\XML\StringElementTrait;
+
+use function in_array;
+use function sprintf;
+
+/**
+ * A AutomaticPseudonyms element
+ *
+ * @package tvdijen/ws-security
+ */
+final class AutomaticPseudonyms extends AbstractFedElement
+{
+    use StringElementTrait;
+
+
+    /**
+     * @param bool $content
+     */
+    public function __construct(bool $content)
+    {
+        $this->setContent($content ? 'true' : 'false');
+    }
+
+
+    /**
+     * Convert XML into a class instance
+     *
+     * @param \DOMElement $xml The XML element we should load
+     * @return static
+     *
+     * @throws \SimpleSAML\XML\Exception\InvalidDOMElementException
+     *   If the qualified name of the supplied element is wrong
+     */
+    public static function fromXML(DOMElement $xml): static
+    {
+        Assert::same($xml->localName, static::getLocalName(), InvalidDOMElementException::class);
+        Assert::same($xml->namespaceURI, static::NS, InvalidDOMElementException::class);
+
+        Assert::oneOf(
+            $xml->textContent,
+            ['0', '1', 'false', 'true'],
+            sprintf(
+                'The value \'%s\' of an %s:%s element must be a boolean.',
+                $xml->textContent,
+                static::NS_PREFIX,
+                static::getLocalName(),
+            ),
+        );
+
+        return new static(in_array($xml->textContent, ['1', 'true'], true));
+    }
+}
diff --git a/tests/WSSecurity/XML/fed/AutomaticPseudonymsTest.php b/tests/WSSecurity/XML/fed/AutomaticPseudonymsTest.php
new file mode 100644
index 00000000..40d22c48
--- /dev/null
+++ b/tests/WSSecurity/XML/fed/AutomaticPseudonymsTest.php
@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\Test\WSSecurity\XML\sp;
+
+use PHPUnit\Framework\TestCase;
+use SimpleSAML\WSSecurity\XML\fed\AutomaticPseudonyms;
+use SimpleSAML\XML\DOMDocumentFactory;
+use SimpleSAML\XML\TestUtils\SchemaValidationTestTrait;
+use SimpleSAML\XML\TestUtils\SerializableElementTestTrait;
+
+use function dirname;
+
+/**
+ * Class \SimpleSAML\WSSecurity\XML\fed\AutomaticPseudonymsTest
+ *
+ * @covers \SimpleSAML\WSSecurity\XML\fed\AutomaticPseudonyms
+ * @covers \SimpleSAML\WSSecurity\XML\fed\AbstractFedElement
+ *
+ * @package tvdijen/ws-security
+ */
+final class AutomaticPseudonymsTest extends TestCase
+{
+    use SchemaValidationTestTrait;
+    use SerializableElementTestTrait;
+
+
+    /**
+     */
+    public static function setUpBeforeClass(): void
+    {
+        self::$schemaFile = dirname(__FILE__, 5) . '/resources/schemas/ws-federation.xsd';
+
+        self::$testedClass = AutomaticPseudonyms::class;
+
+        self::$xmlRepresentation = DOMDocumentFactory::fromFile(
+            dirname(__FILE__, 4) . '/resources/xml/fed_AutomaticPseudonyms.xml',
+        );
+    }
+
+
+    // test marshalling
+
+
+    /**
+     * Test creating a AutomaticPseudonyms object from scratch.
+     */
+    public function testMarshalling(): void
+    {
+        $automaticPseudonyms = new AutomaticPseudonyms(true);
+
+        $this->assertEquals(
+            self::$xmlRepresentation->saveXML(self::$xmlRepresentation->documentElement),
+            strval($automaticPseudonyms),
+        );
+    }
+}
diff --git a/tests/resources/xml/fed_AutomaticPseudonyms.xml b/tests/resources/xml/fed_AutomaticPseudonyms.xml
new file mode 100644
index 00000000..0df2a32e
--- /dev/null
+++ b/tests/resources/xml/fed_AutomaticPseudonyms.xml
@@ -0,0 +1 @@
+<fed:AutomaticPseudonyms xmlns:fed="http://docs.oasis-open.org/wsfed/federation/200706">true</fed:AutomaticPseudonyms>