diff --git a/modules/adfs/lib/IdP/ADFS.php b/modules/adfs/lib/IdP/ADFS.php
index 4581703f5fa31d509e73c95ca538a379df9b4855..b55ce89930ebe3df67cfd8a57499dcca01033565 100644
--- a/modules/adfs/lib/IdP/ADFS.php
+++ b/modules/adfs/lib/IdP/ADFS.php
@@ -1,5 +1,8 @@
 <?php
 
+use RobRichards\XMLSecLibs\XMLSecurityDSig;
+use RobRichards\XMLSecLibs\XMLSecurityKey;
+
 class sspmod_adfs_IdP_ADFS
 {
     public static function receiveAuthnRequest(SimpleSAML_IdP $idp)