diff --git a/libraries/src/Extension/ExtensionHelper.php b/libraries/src/Extension/ExtensionHelper.php
index b1b6b23e5a44e..373fd1b6f6bee 100644
--- a/libraries/src/Extension/ExtensionHelper.php
+++ b/libraries/src/Extension/ExtensionHelper.php
@@ -223,6 +223,7 @@ class ExtensionHelper
 		array('plugin', 'redirect', 'system', 0),
 		array('plugin', 'remember', 'system', 0),
 		array('plugin', 'sef', 'system', 0),
+		array('plugin', 'sessiongc', 'system', 0),
 		array('plugin', 'stats', 'system', 0),
 		array('plugin', 'updatenotification', 'system', 0),