diff --git a/src/Monolog/Processor/MemoryProcessor.php b/src/Monolog/Processor/MemoryProcessor.php
index 28daa28c..7a412386 100644
--- a/src/Monolog/Processor/MemoryProcessor.php
+++ b/src/Monolog/Processor/MemoryProcessor.php
@@ -16,7 +16,7 @@ namespace Monolog\Processor;
  *
  * @author Rob Jensen
  */
-class MemoryProcessor
+abstract class MemoryProcessor
 {
     protected $realUsage;