diff --git a/ChangeLog b/ChangeLog
index 66c26215e4..7a825aec25 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Nov 27 18:04:57 2013  Akira Matsuda  <ronnie@dio.jp>
+
+	* lib/irb/notifier.rb:  Fix typo
+
 Wed Nov 27 17:54:57 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c (gc_mark_stacked_objects): check only when check_mode > 0.
diff --git a/lib/irb/notifier.rb b/lib/irb/notifier.rb
index effb12c30d..20a5b15738 100644
--- a/lib/irb/notifier.rb
+++ b/lib/irb/notifier.rb
@@ -161,7 +161,7 @@ module IRB
 	  @level_notifier = value
 	when Integer
 	  l = @notifiers[value]
-	  Notifier.Raise ErrUndefinedNotifer, value unless l
+	  Notifier.Raise ErrUndefinedNotifier, value unless l
 	  @level_notifier = l
 	else
 	  Notifier.Raise ErrUnrecognizedLevel, value unless l