diff --git a/ChangeLog b/ChangeLog
index fe369eff0f..dc4785bee9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Apr 20 16:18:17 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* common.mk ($(arch)-fake.rb): fix the path separator up for Windows.
+
 Mon Apr 20 15:02:47 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/win32.c (rb_w32_wreadlink): fixed a bug that a junction misses
diff --git a/common.mk b/common.mk
index 839eba3c13..854c1cd93c 100644
--- a/common.mk
+++ b/common.mk
@@ -552,7 +552,7 @@ no-fake: PHONY
 $(arch)-fake.rb: $(RBCONFIG) $(srcdir)/template/fake.rb.in $(srcdir)/tool/expand-config.rb rbconfig.rb
 	@$(BOOTSTRAPRUBY) $(srcdir)/tool/expand-config.rb \
 		-output=$@ -mode=$(INSTALL_PROG_MODE) -expand -config=rbconfig.rb \
-		srcdir="$(srcdir)" BASERUBY="$(BASERUBY)" $(srcdir)/template/fake.rb.in
+		srcdir="$(srcdir)" BASERUBY="$(BASERUBY:\=/)" $(srcdir)/template/fake.rb.in
 
 btest: $(TEST_RUNNABLE)-btest
 no-btest: PHONY