diff --git a/ChangeLog b/ChangeLog
index 280f16b4c1..ddb02da670 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jun 22 21:29:25 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* ext/socket/depend (SOCK_HEADERS): use $(top_srcdir) instaed of
+	  $(topdir). sorry!
+
 Wed Jun 22 19:47:03 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* cont.c (cont_capture): add volatile.
diff --git a/ext/socket/depend b/ext/socket/depend
index 81e4b4f17f..ab0a5e81b3 100644
--- a/ext/socket/depend
+++ b/ext/socket/depend
@@ -1,6 +1,6 @@
 SOCK_HEADERS = $(srcdir)/rubysocket.h $(hdrdir)/ruby/ruby.h $(arch_hdrdir)/ruby/config.h \
 	$(hdrdir)/ruby/defines.h $(hdrdir)/ruby/io.h \
-	$(srcdir)/addrinfo.h $(srcdir)/sockport.h constdefs.h $(topdir)/internal.h
+	$(srcdir)/addrinfo.h $(srcdir)/sockport.h constdefs.h $(top_srcdir)/internal.h
 
 init.o: init.c $(SOCK_HEADERS)
 constants.o: constants.c constdefs.c $(SOCK_HEADERS)