1 files changed, 1 insertions, 1 deletions
diff --git a/lib/logger.rb b/lib/logger.rb
index 14443157cc..9b8bac8e48 100644
--- a/lib/logger.rb
+++ b/lib/logger.rb
@@ -511,7 +511,7 @@ private
 
     def format_datetime(time)
       if @datetime_format.nil?
-        time.strftime("%Y-%m-%dT%H:%M:%S.") << "%06d " % time.usec
+        time.strftime("%Y-%m-%dT%H:%M:%S.%6N ")
       else
         time.strftime(@datetime_format)
       end