diff --git a/lib/logger.rb b/lib/logger.rb
index 489df1dcda..d6539a6f69 100644
--- a/lib/logger.rb
+++ b/lib/logger.rb
@@ -15,6 +15,7 @@ require 'logger/version'
 require 'logger/formatter'
 require 'logger/log_device'
 require 'logger/severity'
+require 'logger/errors'
 
 # == Description
 #
diff --git a/lib/logger/errors.rb b/lib/logger/errors.rb
index e0fb4c643f..8095acc9c8 100644
--- a/lib/logger/errors.rb
+++ b/lib/logger/errors.rb
@@ -1,7 +1,7 @@
+# not used after 1.2.7. just for compat.
 class Logger
   class Error < RuntimeError # :nodoc:
   end
-  # not used after 1.2.7. just for compat.
   class ShiftingError < Error # :nodoc:
   end
 end