1 files changed, 8 insertions, 1 deletions

diff --git a/gl/unlocked-io.h b/gl/unlocked-io.h
index 69ea6641..2b0d13e3 100644
--- a/gl/unlocked-io.h
+++ b/gl/unlocked-io.h
@@ -1,6 +1,6 @@
 /* Prefer faster, non-thread-safe stdio functions if available.
 
-   Copyright (C) 2001-2004, 2009-2025 Free Software Foundation, Inc.
+   Copyright (C) 2001-2004, 2009-2026 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -73,6 +73,13 @@
 #  define fgets_unlocked(x,y,z) fgets (x,y,z)
 # endif
 
+# if HAVE_DECL_FILENO_UNLOCKED || defined fileno_unlocked
+#  undef fileno
+#  define fileno(x) fileno_unlocked (x)
+# else
+#  define fileno_unlocked(x) fileno (x)
+# endif
+
 # if HAVE_DECL_FPUTC_UNLOCKED || defined fputc_unlocked
 #  undef fputc
 #  define fputc(x,y) fputc_unlocked (x,y)