diff --git a/install/lib/update.lib.php b/install/lib/update.lib.php
index 89ad82e0e574dae77029fe293ebed61adf7356b6..581e2d69cb5b126c6c7844dca60e64d91b22cd19 100644
--- a/install/lib/update.lib.php
+++ b/install/lib/update.lib.php
@@ -396,7 +396,7 @@ function updateDbAndIni() {
 	unset($new_ini);
 
 	// Truncate sys_session
-	$inst->db->query("TRUNCATE sys_session");
+	$inst->db->query('TRUNCATE ??', $conf['mysql']['database'].'sys_session');
 }