2 files changed, 9 insertions, 3 deletions

diff --git a/m4/extensions.m4 b/m4/extensions.m4
index 3a556b1e1f7..e114a6f7290 100644
--- a/m4/extensions.m4
+++ b/m4/extensions.m4
@@ -1,4 +1,4 @@
-# serial 14  -*- Autoconf -*-
+# serial 15  -*- Autoconf -*-
 # Enable extensions on systems that normally disable them.
 
 # Copyright (C) 2003, 2006-2016 Free Software Foundation, Inc.
diff --git a/m4/stdio_h.m4 b/m4/stdio_h.m4
index 5149981a804..eaa25a01d49 100644
--- a/m4/stdio_h.m4
+++ b/m4/stdio_h.m4
@@ -1,4 +1,4 @@
-# stdio_h.m4 serial 47
+# stdio_h.m4 serial 48
 dnl Copyright (C) 2007-2016 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,7 +6,13 @@ dnl with or without modifications, as long as this notice is preserved.
 
 AC_DEFUN([gl_STDIO_H],
 [
-  AC_DEFINE([__USE_MINGW_ANSI_STDIO], 1, [Use GNU style printf and scanf.])
+  AH_VERBATIM([MINGW_ANSI_STDIO],
+[/* Use GNU style printf and scanf.  */
+#ifndef __USE_MINGW_ANSI_STDIO
+# undef __USE_MINGW_ANSI_STDIO
+#endif
+])
+  AC_DEFINE([__USE_MINGW_ANSI_STDIO])
   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
   gl_NEXT_HEADERS([stdio.h])