diff --git a/src/Monolog/Logger.php b/src/Monolog/Logger.php
index 16215cdc..430a9953 100644
--- a/src/Monolog/Logger.php
+++ b/src/Monolog/Logger.php
@@ -139,7 +139,7 @@ class Logger implements LoggerInterface
     /**
      * @var bool
      */
-    protected $microsecondTimestamps = true;
+    protected $microsecondTimestamps = false;
 
     /**
      * @var DateTimeZone