diff --git a/admin/inc/class.boaccounts.inc.php b/admin/inc/class.boaccounts.inc.php
index 52ec890b974..437ebc0ac66 100755
--- a/admin/inc/class.boaccounts.inc.php
+++ b/admin/inc/class.boaccounts.inc.php
@@ -88,6 +88,7 @@
 			$GLOBALS['phpgw']->db->lock(
 				Array(
 					'phpgw_accounts',
+					'phpgw_app_sessions',
 					'phpgw_acl'
 				)
 			);