diff --git a/ChangeLog b/ChangeLog
index 06a82661c0..c3c70f2049 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sat Jul  9 12:43:09 2016  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* tool/mkconfig.rb: use true instead of TRUE.
+
+	* lib/getoptlong.rb: use false instead of FALSE.
+
 Fri Jul  8 21:49:28 2016  Naohisa Goto  <ngotogenome@gmail.com>
 
 	* thread.c (rb_wait_for_single_fd): Clean up fds.revents every time
diff --git a/lib/getoptlong.rb b/lib/getoptlong.rb
index 8aa91b82e0..c0ba5399b7 100644
--- a/lib/getoptlong.rb
+++ b/lib/getoptlong.rb
@@ -153,7 +153,7 @@ class GetoptLong
     #
     # Whether error messages are output to $stderr.
     #
-    @quiet = FALSE
+    @quiet = false
 
     #
     # Status code.