diff --git a/ChangeLog b/ChangeLog
index e78debfce3..f0bd64240e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Apr 12 21:06:55 2013  Tanaka Akira  <akr@fsij.org>
+
+	* common.mk: pack.o depends on internal.h.
+
 Fri Apr 12 20:59:24 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (ones): Use __builtin_popcountl if available.
diff --git a/common.mk b/common.mk
index d996bc501d..d21b4ec54b 100644
--- a/common.mk
+++ b/common.mk
@@ -697,7 +697,7 @@ numeric.$(OBJEXT): {$(VPATH)}numeric.c $(RUBY_H_INCLUDES) \
 object.$(OBJEXT): {$(VPATH)}object.c $(RUBY_H_INCLUDES) {$(VPATH)}util.h \
   {$(VPATH)}internal.h {$(VPATH)}constant.h $(ENCODING_H_INCLUDES) $(PROBES_H_INCLUDES) {$(VPATH)}vm_opts.h
 pack.$(OBJEXT): {$(VPATH)}pack.c $(RUBY_H_INCLUDES) {$(VPATH)}encoding.h \
-  {$(VPATH)}oniguruma.h
+  {$(VPATH)}oniguruma.h {$(VPATH)}internal.h
 parse.$(OBJEXT): {$(VPATH)}parse.c $(RUBY_H_INCLUDES) {$(VPATH)}node.h \
   $(ENCODING_H_INCLUDES) {$(VPATH)}id.h {$(VPATH)}regenc.h \
   {$(VPATH)}regex.h {$(VPATH)}util.h {$(VPATH)}lex.c \