diff --git a/ChangeLog b/ChangeLog
index 8d946cc9a5..34be2cc9ab 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -82,7 +82,7 @@ Wed Nov  5 16:26:58 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 Wed Nov  5 15:05:12 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* string.c (rb_str_{,l,r}strip_bang): rb_str_subseq() will not
-	  NUL-terminate the result string, in the future, so it will not
+	  NULL-terminate the result string, in the future, so it will not
 	  be needed in other cases.
 
 Wed Nov  5 14:11:30 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>