diff --git a/www/saml2/idp/ArtifactResolutionService.php b/www/saml2/idp/ArtifactResolutionService.php
index d0e1e05d67e7cf14c4f410e0ed2bd04c4d634fb3..162937c839a45aad81a1f2a88c4d3b57561feafa 100644
--- a/www/saml2/idp/ArtifactResolutionService.php
+++ b/www/saml2/idp/ArtifactResolutionService.php
@@ -11,7 +11,7 @@
 require_once('../../_include.php');
 
 $config = \SimpleSAML\Configuration::getInstance();
-if (!$config->getBoolean('enable.saml20-idp', false) || !Module::isModuleEnabled('saml')) {
+if (!$config->getBoolean('enable.saml20-idp', false) || !\SimpleSAML\Module::isModuleEnabled('saml')) {
     throw new \SimpleSAML\Error\Error('NOACCESS');
 }