1 files changed, 4 insertions, 3 deletions

diff --git a/gl/m4/setlocale_null.m4 b/gl/m4/setlocale_null.m4
index e5b7d28b..3c8b693e 100644
--- a/gl/m4/setlocale_null.m4
+++ b/gl/m4/setlocale_null.m4
@@ -1,11 +1,12 @@
 # setlocale_null.m4
-# serial 9
-dnl Copyright (C) 2019-2024 Free Software Foundation, Inc.
+# serial 10
+dnl Copyright (C) 2019-2025 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
+dnl This file is offered as-is, without any warranty.
 
-AC_DEFUN([gl_FUNC_SETLOCALE_NULL],
+AC_DEFUN_ONCE([gl_FUNC_SETLOCALE_NULL],
 [
   AC_REQUIRE([AC_CANONICAL_HOST])
   AC_REQUIRE([gl_PTHREADLIB])