diff --git a/lib/IdP/ADFS.php b/lib/IdP/ADFS.php
index 0eecc59..5e5a697 100644
--- a/lib/IdP/ADFS.php
+++ b/lib/IdP/ADFS.php
@@ -138,7 +138,7 @@ private static function generateResponse(
 </wst:RequestSecurityTokenResponse>
 MSG;
 
-        return $result;
+    return trim(preg_replace('/^\s+|\r|\n/m', '', $result));
     }