diff --git a/src/XML/ecp/RequestAuthenticated.php b/src/XML/ecp/RequestAuthenticated.php
index e452b493b..735dd2b3e 100644
--- a/src/XML/ecp/RequestAuthenticated.php
+++ b/src/XML/ecp/RequestAuthenticated.php
@@ -71,7 +71,7 @@ public static function fromXML(DOMElement $xml): static
             $mustUnderstand = $xml->getAttributeNS(C::NS_SOAP_ENV_11, 'mustUnderstand');
 
             Assert::nullOrOneOf(
-               $mustUnderstand,
+                $mustUnderstand,
                 ['0', '1'],
                 'Invalid value of env:mustUnderstand attribute in <ecp:RequestAuthenticated>.',
                 ProtocolViolationException::class,