diff --git a/ChangeLog b/ChangeLog
index ead886b157..3f977f2a68 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]
+
 Tue Sep  1 19:56:28 2009  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_eval.c (eval_string_with_cref): fix to check local_table_size.
diff --git a/Makefile.in b/Makefile.in
index 698fb4ac9c..9f6bb7b290 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -121,6 +121,8 @@ 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 2d9f59f152..0345274e10 100644
--- a/common.mk
+++ b/common.mk
@@ -422,7 +422,7 @@ 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/version.h b/version.h
index 260fdbd0ec..1d8edee6da 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.1"
-#define RUBY_PATCHLEVEL 310
+#define RUBY_PATCHLEVEL 311
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 9
 #define RUBY_VERSION_TEENY 1
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 064511adf9..1963290aad 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -262,6 +262,8 @@ INSTALLED_LIST= .installed.list
 
 MKMAIN_CMD    = mkmain.bat
 
+SRC_FILE = $(<:\=/)
+
 !if !defined(WINMAINOBJ)
 WINMAINOBJ    = winmain.$(OBJEXT)
 !endif