diff --git a/ChangeLog b/ChangeLog
index 6563674569..7111c24760 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Mar 15 09:17:26 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* common.mk (.y.c): use SRC_FILE which contains slashes instead of
+	  backslashes.  [ruby-core:22891]
+
 Sun Mar 15 08:26:16 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* common.mk (srcs-ext): creates ext/dl/callback/callback.c also.
diff --git a/Makefile.in b/Makefile.in
index 975f127b6c..6f617c34d2 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -122,6 +122,8 @@ MANTYPE	      = @MANTYPE@
 INSTALLED_LIST= .installed.list
 
 MKMAIN_CMD    = mkmain.sh
+
+SRC_FILE      = $<
 #### End of variables
 
 all:
diff --git a/common.mk b/common.mk
index a316d1e2f5..62c755dd03 100644
--- a/common.mk
+++ b/common.mk
@@ -435,7 +435,7 @@ PHONY:
 parse.h {$(VPATH)}parse.h: {$(VPATH)}parse.c
 
 {$(srcdir)}.y.c:
-	$(YACC) -d $(YFLAGS) -o y.tab.c $<
+	$(YACC) -d $(YFLAGS) -o y.tab.c $(SRC_FILE)
 	sed -f $(srcdir)/tool/ytab.sed -e "/^#/s!y\.tab\.c!$@!" y.tab.c > $@.new
 	@$(MV) $@.new $@
 	sed -e "/^#line.*y\.tab\.h/d;/^#line.*parse\.y/d" y.tab.h > $(@:.c=.h).new
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 37f9a8236f..aa3bcaf55b 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -271,6 +271,8 @@ INSTALLED_LIST= .installed.list
 
 MKMAIN_CMD    = mkmain.bat
 
+SRC_FILE = $(<:\=/)
+
 !if !defined(WINMAINOBJ)
 WINMAINOBJ    = winmain.$(OBJEXT)
 !endif