diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
index 5cdac63939..daabbc21f0 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
@@ -387,7 +387,7 @@ class PdoSessionHandler implements \SessionHandlerInterface
             $this->gcCalled = false;
 
             // delete the session records that have expired
-            $sql = "DELETE FROM $this->table WHERE $this->lifetimeCol + $this->timeCol < :time";
+            $sql = "DELETE FROM $this->table WHERE $this->lifetimeCol < :time - $this->timeCol";
 
             $stmt = $this->pdo->prepare($sql);
             $stmt->bindValue(':time', time(), \PDO::PARAM_INT);