diff --git a/ChangeLog b/ChangeLog
index b116d43b40..5ad1aeff05 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Nov 21 14:25:40 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* win32/Makefile.sub (top_srcdir): added because lacking this macro
+	  causes build error at r48526.
+
 Fri Nov 21 12:00:58 2014  Tanaka Akira  <akr@fsij.org>
 
 	* tool/update-deps (in_makefile): Use FILES_NEED_VPATH and
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 5aad997f00..9c205449a2 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -364,6 +364,7 @@ ENCSTATIC = static
 !endif
 
 arch_hdrdir = $(EXTOUT)/include/$(arch)
+top_srcdir = $(srcdir)
 hdrdir = $(srcdir)/include
 VPATH = $(arch_hdrdir)/ruby;$(hdrdir)/ruby;$(srcdir);$(srcdir)/enc;$(srcdir)/missing;$(win_srcdir)