diff --git a/win32/setup.mak b/win32/setup.mak
index 3b822a33c0..0a1421f0bb 100644
--- a/win32/setup.mak
+++ b/win32/setup.mak
@@ -183,14 +183,26 @@ main(void)
 
 -version-: nul verconf.mk
 
+!if !(exist(revision.h) || exist($(srcdir)/revision.h))
+revision_opt = -DRUBY_REVISION=0
+!endif
+
 verconf.mk: nul
 	@findstr /R /C:"^#define RUBY_ABI_VERSION " $(srcdir:/=\)\include\ruby\internal\abi.h > $(@)
-	@$(CPP) -I$(srcdir) -I$(srcdir)/include <<"Creating $(@)" > $(*F).bat && cmd /c $(*F).bat > $(@)
+	@$(CPP) -I$(srcdir) -I$(srcdir)/include $(revision_opt) <<"Creating $(@)" > $(*F).bat && cmd /c $(*F).bat > $(@)
 @echo off
-#define RUBY_REVISION 0
 #define STRINGIZE0(expr) #expr
 #define STRINGIZE(x) STRINGIZE0(x)
 #include "version.h"
+#ifndef RUBY_RELEASE_YEAR
+# define RUBY_RELEASE_YEAR 0000
+#endif
+#ifndef RUBY_RELEASE_MONTH
+# define RUBY_RELEASE_MONTH 00
+#endif
+#ifndef RUBY_RELEASE_DAY
+# define RUBY_RELEASE_DAY 00
+#endif
 set ruby_release_year=RUBY_RELEASE_YEAR
 set ruby_release_month=RUBY_RELEASE_MONTH
 set ruby_release_day=RUBY_RELEASE_DAY