diff --git a/main/auth/shibboleth/app/lib/shibboleth_session.class.php b/main/auth/shibboleth/app/lib/shibboleth_session.class.php
index 6c4e4a9802..c188eaf834 100644
--- a/main/auth/shibboleth/app/lib/shibboleth_session.class.php
+++ b/main/auth/shibboleth/app/lib/shibboleth_session.class.php
@@ -53,6 +53,7 @@ class ShibbolethSession
             return;
         }
 
+        session_unset();
         api_session_register('_uid');
 
         global $_user;