diff --git a/ChangeLog b/ChangeLog
index 7eabe4460e..5b1a84a710 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Sep 13 06:03:34 2016  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* common.mk (benchmark): fix lib path.
+
 Tue Sep 13 00:39:47 2016  Aaron Patterson <tenderlove@ruby-lang.org>
 
 	* class.c (singleton_class_of): Copy superclass serial number to
diff --git a/common.mk b/common.mk
index c2a2d8fd90..c7b6751eda 100644
--- a/common.mk
+++ b/common.mk
@@ -963,17 +963,17 @@ OPTS =
 # This command compares trunk and built-ruby and 2.2.2
 benchmark: miniruby$(EXEEXT) PHONY
 	$(BASERUBY) $(srcdir)/benchmark/driver.rb -v \
-	            --executables="$(COMPARE_RUBY) -I../../ruby/lib -I. -I.ext/common --disable-gem; built-ruby::$(MINIRUBY) --disable-gem" \
+	            --executables="$(COMPARE_RUBY) -Ilib -I. -I.ext/common --disable-gem; built-ruby::$(MINIRUBY) --disable-gem" \
 	            --pattern='bm_' --directory=$(srcdir)/benchmark $(OPTS)
 
 benchmark-each: miniruby$(EXEEXT) PHONY
 	$(BASERUBY) $(srcdir)/benchmark/driver.rb -v \
-	            --executables="$(COMPARE_RUBY) -I../../ruby/lib -I. -I.ext/common --disable-gem; built-ruby::$(MINIRUBY) --disable-gem" \
+	            --executables="$(COMPARE_RUBY) -Ilib -I. -I.ext/common --disable-gem; built-ruby::$(MINIRUBY) --disable-gem" \
 	            --pattern=$(ITEM) --directory=$(srcdir)/benchmark $(OPTS)
 
 tbench: miniruby$(EXEEXT) PHONY
 	$(BASERUBY) $(srcdir)/benchmark/driver.rb -v \
-	            --executables="$(COMPARE_RUBY) -I../../ruby/lib -I. -I.ext/common --disable-gem; built-ruby::$(MINIRUBY) --disable-gem" \
+	            --executables="$(COMPARE_RUBY) -Ilib -I. -I.ext/common --disable-gem; built-ruby::$(MINIRUBY) --disable-gem" \
 	            --pattern='bmx_' --directory=$(srcdir)/benchmark $(OPTS)
 
 run.gdb: