diff --git a/version.h b/version.h
index 2b7d4f8f91..1e9078f3ac 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 6
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 204
+#define RUBY_PATCHLEVEL 205
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 12
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 0bc5efbfb2..858d14758b 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -635,7 +635,9 @@ $(CONFIG_H): $(MKFILES) $(srcdir)/win32/Makefile.sub $(win_srcdir)/Makefile.sub
 #define SIZEOF_LONG_LONG 0
 !endif
 #define SIZEOF___INT64 8
+#ifndef _INTEGRAL_MAX_BITS
 #define _INTEGRAL_MAX_BITS 64
+#endif
 !if $(LARGEFILE_SUPPORT)
 #define SIZEOF_OFF_T 8
 !else