diff --git a/lib/SimpleSAML/Auth/Simple.php b/lib/SimpleSAML/Auth/Simple.php
index e3fedad714c096d829413ca35dd7526024b563e0..0f52035722566ad1565327fc68f630273c8eca1b 100644
--- a/lib/SimpleSAML/Auth/Simple.php
+++ b/lib/SimpleSAML/Auth/Simple.php
@@ -153,7 +153,7 @@ class SimpleSAML_Auth_Simple {
 			assert('FALSE');
 		}
 
-		SimpleSAML_Auth_Default::initLogout($url);
+		SimpleSAML_Auth_Default::initLogout($url, $this->authSource);
 	}