diff --git a/ChangeLog b/ChangeLog
index 958c9e550f..36335df757 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Aug 14 14:31:33 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (rubyhdrdir): fixed typo.  [ruby-dev:39079]
+
 Fri Aug 14 00:29:22 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* doc/ChangeLog-1.8.0: add forgotten entry contributed by
diff --git a/configure.in b/configure.in
index 1f807049fb..f881cd82f1 100644
--- a/configure.in
+++ b/configure.in
@@ -2489,7 +2489,7 @@ if test "$search_path" != ""; then
 fi
 
 AC_ARG_WITH(rubyhdrdir,
-	    AS_HELP_STRING([--with-rubyhdrdir=DIR], [core headers in DIR [[INCLUDEDIR/RUBY_BASE_NAME/RUBY_VERSION]]]),
+	    AS_HELP_STRING([--with-rubyhdrdir=DIR], [core headers in DIR [[INCLUDEDIR/RUBY_BASE_NAME-RUBY_VERSION]]]),
 	    [rubyhdrdir=$withval],
 	    [rubyhdrdir='${includedir}/${RUBY_BASE_NAME}-${ruby_version}'])