diff --git a/ChangeLog b/ChangeLog
index 7cdcb40ef5..08a73d5ff7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Aug  8 08:58:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* common.mk (RUBY_H_INCLUDES): add subst.h.
+
 Sun Aug  8 08:55:37 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (ruby_snprintf): printf attribute. 
diff --git a/common.mk b/common.mk
index 0ecc786a5e..66aaea9ae6 100644
--- a/common.mk
+++ b/common.mk
@@ -509,7 +509,8 @@ win32.$(OBJEXT): {$(VPATH)}win32.c $(RUBY_H_INCLUDES)
 ###
 
 RUBY_H_INCLUDES    = {$(VPATH)}ruby.h {$(VPATH)}config.h {$(VPATH)}defines.h \
-		     {$(VPATH)}intern.h {$(VPATH)}missing.h {$(VPATH)}st.h
+		     {$(VPATH)}intern.h {$(VPATH)}missing.h {$(VPATH)}st.h \
+		     {$(VPATH)}subst.h
 ENCODING_H_INCLUDES= {$(VPATH)}encoding.h {$(VPATH)}oniguruma.h
 ID_H_INCLUDES      = {$(VPATH)}id.h
 VM_CORE_H_INCLUDES = {$(VPATH)}vm_core.h {$(VPATH)}vm_opts.h \