diff --git a/ChangeLog b/ChangeLog
index 446d7ef709..36c8420c34 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Sep 23 18:07:55 2008  Koichi Sasada  <ko1@atdot.net>
+
+	* common.mk (io.o): remove dependency for vm_core.h.
+
 Tue Sep 23 17:56:44 2008  Koichi Sasada  <ko1@atdot.net>
 
 	* thread.c (rb_thread_blocking_region): fix typo in a document.
diff --git a/common.mk b/common.mk
index d6eaef6827..8dc231e7c9 100644
--- a/common.mk
+++ b/common.mk
@@ -476,7 +476,7 @@ gc.$(OBJEXT): {$(VPATH)}gc.c $(RUBY_H_INCLUDES) \
 hash.$(OBJEXT): {$(VPATH)}hash.c $(RUBY_H_INCLUDES) {$(VPATH)}util.h
 inits.$(OBJEXT): {$(VPATH)}inits.c $(RUBY_H_INCLUDES)
 io.$(OBJEXT): {$(VPATH)}io.c $(RUBY_H_INCLUDES) {$(VPATH)}io.h \
-  {$(VPATH)}util.h $(VM_CORE_H_INCLUDES) $(ENCODING_H_INCLUDES)
+  {$(VPATH)}util.h $(ENCODING_H_INCLUDES)
 main.$(OBJEXT): {$(VPATH)}main.c $(RUBY_H_INCLUDES) {$(VPATH)}debug.h {$(VPATH)}node.h
 marshal.$(OBJEXT): {$(VPATH)}marshal.c $(RUBY_H_INCLUDES) \
   {$(VPATH)}io.h $(ENCODING_H_INCLUDES) {$(VPATH)}util.h