diff --git a/lib/SimpleSAML/Session.php b/lib/SimpleSAML/Session.php
index 2b061789489c5b2609471a1f2c46625c6a75e00d..cd491391c31e1005e1d1c8c26649f3808a28e46f 100644
--- a/lib/SimpleSAML/Session.php
+++ b/lib/SimpleSAML/Session.php
@@ -332,6 +332,7 @@ class SimpleSAML_Session {
 
 		$this->authenticated = FALSE;
 		$this->authority = NULL;
+		$this->attributes = NULL;
 	}