diff --git a/src/Monolog/Handler/BufferHandler.php b/src/Monolog/Handler/BufferHandler.php
index a2515b64..c3fcc4ae 100644
--- a/src/Monolog/Handler/BufferHandler.php
+++ b/src/Monolog/Handler/BufferHandler.php
@@ -13,6 +13,7 @@ namespace Monolog\Handler;
 
 use Monolog\Logger;
 use Monolog\ResettableInterface;
+use Monolog\Formatter\FormatterInterface;
 
 /**
  * Buffers all records until closing the handler and then pass them as batch.