diff --git a/ChangeLog b/ChangeLog
index 3645ecb791..e0a015ffff 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed May 23 15:39:02 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* common.mk: add a rule for regsyntax.c.
+
 Wed May 23 10:31:53 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* oniguruma.h: updated to Oniguruma 5.7.0.
diff --git a/common.mk b/common.mk
index 8052dae088..a897642123 100644
--- a/common.mk
+++ b/common.mk
@@ -53,6 +53,7 @@ OBJS	      = array.$(OBJEXT) \
 		regerror.$(OBJEXT) \
 		regexec.$(OBJEXT) \
 		regparse.$(OBJEXT) \
+		regsyntax.$(OBJEXT) \
 		ruby.$(OBJEXT) \
 		signal.$(OBJEXT) \
 		sjis.$(OBJEXT) \
@@ -492,6 +493,9 @@ regparse.$(OBJEXT): {$(VPATH)}regparse.c {$(VPATH)}oniguruma.h \
   {$(VPATH)}regint.h {$(VPATH)}regparse.h {$(VPATH)}regenc.h config.h \
   {$(VPATH)}ruby.h {$(VPATH)}defines.h {$(VPATH)}missing.h \
   {$(VPATH)}intern.h {$(VPATH)}rubysig.h
+regsyntax.$(OBJEXT): {$(VPATH)}regsyntax.c {$(VPATH)}oniguruma.h \
+  {$(VPATH)}regint.h {$(VPATH)}regenc.h config.h \
+  {$(VPATH)}ruby.h {$(VPATH)}defines.h {$(VPATH)}missing.h
 ruby.$(OBJEXT): {$(VPATH)}ruby.c {$(VPATH)}ruby.h config.h \
   {$(VPATH)}defines.h {$(VPATH)}intern.h {$(VPATH)}missing.h \
   {$(VPATH)}dln.h {$(VPATH)}node.h {$(VPATH)}util.h