diff --git a/ChangeLog b/ChangeLog
index b7e2c33dcb..580440e619 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jun 20 14:00:34 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* common.mk: remove dependency from ruby.
+
 Thu Jun 20 13:14:06 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* error.c (rb_check_backtrace): evaluate RARRAY_AREF only once.
diff --git a/common.mk b/common.mk
index 429e7a0416..83e6ce7599 100644
--- a/common.mk
+++ b/common.mk
@@ -426,15 +426,15 @@ rdoc-coverage: PHONY main
 
 RDOCBENCHOUT=/tmp/rdocbench
 
-gcbench-rdoc: PHONY ruby
+gcbench-rdoc: PHONY
 	@echo Benchmark with Generating RDoc documentation
 	$(Q) $(XRUBY) "$(srcdir)/tool/gcbench.rb" "$(srcdir)/tool/rdocbench.rb" --root "$(srcdir)" --page-dir "$(srcdir)/doc" --encoding=UTF-8 --no-force-update --all --ri  --debug $(RDOCFLAGS) --quiet "$(srcdir)"
 
-gcbench-hash1: PHONY ruby
+gcbench-hash1: PHONY
 	@echo "Benchmark with hashbench1 (many temporal objects / obj count intensive)"
 	$(Q) $(XRUBY) "$(srcdir)/tool/gcbench.rb" "$(srcdir)/tool/hashbench1.rb"
 
-gcbench-hash2: PHONY ruby
+gcbench-hash2: PHONY
 	@echo "Benchmark with hashbench2 (increasing hash size / malloc intensive)"
 	$(Q) $(XRUBY) "$(srcdir)/tool/gcbench.rb" "$(srcdir)/tool/hashbench2.rb"