diff --git a/src/Bernard/Driver/DoctrineDriver.php b/src/Bernard/Driver/DoctrineDriver.php
index bece2611..afb2bf1a 100644
--- a/src/Bernard/Driver/DoctrineDriver.php
+++ b/src/Bernard/Driver/DoctrineDriver.php
@@ -69,8 +69,9 @@ public function createQueue($queueName)
      */
     public function countMessages($queueName)
     {
-        return $this->connection->fetchColumn('SELECT COUNT(id) FROM bernard_messages WHERE queue = :queue AND visible = 1', array(
+        return $this->connection->fetchColumn('SELECT COUNT(id) FROM bernard_messages WHERE queue = :queue AND visible = :visible', array(
             'queue' => $queueName,
+            'visible' => true,
         ));
     }