diff --git a/ChangeLog b/ChangeLog
index cad30526c2..4f1e6a0837 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Apr  2 15:12:18 2014  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* common.mk: Use redmine-2.x url for DeveloperHowto wiki.
+	  [ruby-core:60657] [Bug #9511]
+
 Wed Apr  2 11:46:29 2014  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
 
 	* ext/pathname/lib/pathname.rb (Pathname#join): Fix error with
diff --git a/common.mk b/common.mk
index b0ab4f81d7..ca0a118809 100644
--- a/common.mk
+++ b/common.mk
@@ -1102,5 +1102,5 @@ help: PHONY
 	"  golf:            for golfers" \
 	"" \
 	"see DeveloperHowto for more detail: " \
-	"  http://bugs.ruby-lang.org/wiki/ruby/DeveloperHowto" \
+	"  https://bugs.ruby-lang.org/projects/ruby/wiki/DeveloperHowto" \
 	$(MESSAGE_END)