diff --git a/lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php b/lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php
index feb39931eb6..2f13a942aed 100644
--- a/lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php
+++ b/lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php
@@ -280,6 +280,17 @@ public function delete($tableName, array $identifier, array $types = array())
         return parent::delete($tableName, $identifier, $types);
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function close()
+    {
+        unset($this->connections['master']);
+        unset($this->connections['slave']);
+
+        parent::close();
+    }
+
     /**
      * {@inheritDoc}
      */