diff --git a/ChangeLog b/ChangeLog
index b57ea1b38b..b7fcac8de5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Jan 27 04:02:53 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* ext/ripper/depend: fixed dependency path to lex.c.
+	  [ruby-core:21570]
+
 Tue Jan 27 03:43:34 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* hash.c (rb_any_hash): fixed performance issues with nil, true,
diff --git a/ext/ripper/depend b/ext/ripper/depend
index e8a53e436b..d063b17cc5 100644
--- a/ext/ripper/depend
+++ b/ext/ripper/depend
@@ -5,7 +5,7 @@ BISON = bison
 
 src: ripper.c eventids1.c eventids2table.c
 
-ripper.o: ripper.c lex.c eventids1.c eventids2.c eventids2table.c \
+ripper.o: ripper.c $(top_srcdir)/lex.c eventids1.c eventids2.c eventids2table.c \
 	$(hdrdir)/ruby/ruby.h $(arch_hdrdir)/ruby/config.h \
 	$(hdrdir)/ruby/defines.h $(hdrdir)/ruby/intern.h \
 	$(hdrdir)/ruby/encoding.h $(hdrdir)/missing.h \